Your webpage does not contain any H1 headings.

Hi,

This particular issue is flagged when you have no h1 elements within your DOM structure.

This is a common issue when you disable Site or Page title display.

Crawler bots from search engines usually look for H1 or <h1> heading which usually contains content context or information about the page which is used for indexing.

When you disable the Site/Page title, the theme/plugin doesn't render the <h1> heading so you get “Your webpage does not contain any H1 headings” issue.

To address this issue, make sure the site/page title isn't disabled the within the Layout Element or within the page/post's layout metabox.

Can you let me know where is present this option, "site/page title isn’t disabled the within the Layout Element or within the page/post’s layout metabox".?

In your site's context, you'll have to insert an h1 tag for your homepage.

Since your site doesn't seem to be using site title, you can follow Tom's answer here:
https://generatepress.com/forums/topic/h1-tag-missing-from-homepage/#post-1336506

Getting error "Unable to execute PHP as DISALLOW_FILE_EDIT is defined"

Getting error “Unable to execute PHP as DISALLOW_FILE_EDIT is defined”

You can check our brief documentation on how to address this issue:
https://docs.generatepress.com/article/disallow-php-execution/

I am not a technial person, can you help me?

We cannot make changes to your site for things like this unfortunately.

However, Tom's code here doesn't require using PHP checkbox though:
https://generatepress.com/forums/topic/h1-tag-missing-from-homepage/#post-1336506

Can you try the solution first?