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I’ll address only the Jazzy Form problem here.

There is no need for a calculate button because Jazzy Forms does the calculation ineractively. Make sure on the edit pages of Jazzy forms under General tab that the checkbox “Update output elements instantly” is checked.

As soon as you complete an entry in a form element it will change your final result as you change an item. After and edit you may need to click somewhere (or refresh) on the page just to make sure the change is recognised.

In the configuration of each drop down you assign a title which appears above the drop down and variable name (labeled ID ) that is used in the final formula calculation. In the Options box you can set what number is returned depending on what the user has selected in the drop down and that number is what is placed in the ID variable.

It may be important for you to consider the default case at the start where the user has not yet enetered anything. My opinion is that a form should begin with a sensible value in the result box.

Your error suggests that you have made a mistake with the variable name. The formula for the result field is using an ID name that doesn’t exist. Perhaps this is just a typing error in the formula.

You can debug this by making the result field formula the result of just one drop down and gradually increasing the number of other drop down elements..

You can run two browser pages simultaneously, one with the form editor and the other with the page displaying the form. Edit your Jazzy form, don’t forget to click save. Then go to the display page and click on the refresh button so see the results of your edits.

You need to give a bit moe information fro anyone to help you.
What form elements have you created in your form?

What calculations from those elements are trying to do?

What is happening or what is not happening?
Are there any error clues in your result field?

A PayPal interface is the final part needed to complete Jazzy forms as an e-commerce utility. Any of the suggestions above are what is needed to get this going.

I like the “buy now” button idea best.
Paypals html “buy now” button is eight lines of code.
Jazzy could perhaps implement this by creating a Paypal element created from code duplicating the PayPal element button but substituting the “item_name” and “amounts” for a formula derrived from other Jazzy form elements.

Great to see you have your site working and it looks good.

I hasten to add the plugin is not mine.

Which theme are you using on your site? I am using “Twenty Ten” because I wanted a simple banner across the top but this theme results in a big separation between my Jazzy Form elements.
I tried altering the CSS but is not working very well.
Did you override the CSS? Your site’s style is the type of format I want.

Without better explanation I could waste the time and looked around for alternatives. I found Jazzy Forms plugin does the calculation function well and is under development. For your purposes Jazzy forms will do well. It isn’t very good at formating output. I found the drop downs I was using to be separated excessively. You can to override the default CSS with something of you own if appearance is important but there lies a time consuming business.

I found someone that speaks Russian and put the English and Russian transcripts in front of him. He reckoned Google Translate had done a pretty good job but didn’t understand what was meant by the text.

Can you explain what does sign up and sign down mean?

How and where do I put a formula that says something like take the first field add it to the second multiply by the third and put the answer in another field?

This is very much in Russian but looks like it might be the Russian version of https://www.ads-software.com/extend/plugins/wp-creator-calculator/
Perhaps there is someone that has done something easy in English

What is meant by “arithmetic sign”. In English it can refer to whether a variable is positive or negative but here I think it might mean equation. In which case what is the format of the equation.

How do define an action. The meaning of the code in hte SESSION section is unclear. What are the bracketed numbers and what are the numbers to the right of the “=>” symbol ?

A few simple English examples would help please. Perhaps I can help you by writing som better English instructions. Could you provide a few more clues please.