Hello sylvia

Apology for the inconvenience. Please share your administrator access here to check the issue. Use the Hidden Content box to share the credentials. Make sure that you have a full site backup with you before sharing.

Best regards

If I may...

1. do you have enabled Comodo WAF on your server , or different firewall ?
2. please share link to screenshot how looks your "broken" template options page?

I already send you the information

I wasn't able to access my backend error: Warning! Internet Explorer should not be used for proper operation of the Administrator Backend. I followed instructions to fixed this renamed .htaccess file but that doesn't work properly because the website didn't work with Search Engine Friendly URLs Then I read more and I try severals options, then I think, what if I remove part of the .htaccess file and try again. This works fine and I think this is the solution.