Where can I find the comments we can put in the Donor Comments area to explain what comments they should leave. Like the Explanation of what goes in this area
You can enable the Donor Comments functionality by navigating to donations > all forms > click to edit your form > form fields > Donor Comments. You can enable it on a per-form basis or globally too.
Regarding adding a section where you explain what the comment field is for, you need to insert text using WP hooks to reposition it. It’s complicated.