Contents are not changing even after switching language

Your “site url” points to nonexistent domain.

The site was populated with English content before you installed qtx, and then you set the default to Spanish, and then populated content in Spanish, is that right?

This is a rather unusual sequence. You will get problems with tags and categories translations in such a case for the least: https://qtranslatexteam.wordpress.com/faq/#TermsInDb. I am not sure what else might be broken. It is essentially a switch of the default language, which may be a hard thing to do, depending on the complexity of the site.

I am not sure how to proceed, I guess we can help you to fix all the issues, since it is some exceptional case and it is hard to say what got broken. Although, the problem might be something else and simple, but it is hard to say without seeing the code. Thanks.

yes sir, you are correct about the second paragraph.
here is my site url site

I built a the site on English, and then installed the qtx afterwards I changed the default language to Spanish, left all other settings as was recommended on the startup guide.
then I added the language menu on my site menu.
taught I did everything right?
please can you help me with this.
will appreciate a lot.

I have already sent you page which has link to contact us.

just contacted you