[Plugin: WordPress Simple Ecommerce Shopping Cart Plugin- Sell products through Paypal] basic help

i am a complete novice so this is going to be an uber basic question, but i can’t get the basic code to work on my site in order to pull up the 5 products I just created. I cut & pasted what you said to add: [bizcart_add_to_cart id=”prodcutID” ] into a page and I inserted the product id # in where you have “productID so it looks like: [bizcart_add_to_cart id=”1”] to no avail. I’ve tried a few variations too but I have absolutely no idea what I am doing much less why it won’t work. Please advise.
https://alphaxidelta-houston.org/membership/

https://www.ads-software.com/extend/plugins/simple-e-commerce-shopping-cart/