Remove attribution between post title and post

This depends entirely on your theme. In some themes, it can be hidden using CSS. A link to your site might allow someone to help with this.

If you are using a paid theme, contact the theme supplier. You paid for support – you should get it.

I had a feeling it would be theme dependent.
See it here:
https://guitarstudyreviews.com/?page_id=706

The theme is InReview from Elegant Themes.

Thank you.

Try adding this to the end of style.css:

p.et_pt_blogmeta { display: none; }