Theme changes on posts

For instance, I’d change the “Posted” and “By” on the front layout…

those might be in index.php or home.php or in any template parts or functions which might get called in those templates.

this forum cannot help much as you are using a commmercial theme – https://codex.www.ads-software.com/Forum_Welcome#Commercial_Products

please contact the developer of your theme for help with your question.