Hello Scratch!
I realized that there is no way to edit comments after they're posted, and there's also no way to delete them. You can edit and delete forum posts, but not comments. The ability to edit comments would be beneficial because if you forgot to say something, you'd no longer have to reply to your own comment (which can be interpreted as spam to the recipient). The ability to delete comments would be helpful if someone says something they wish to take back, or if someone makes a comment that's irrelevant. Thanks!

Nevermind, I didn't know this was a rejected feature when I posted it.

The Scratch Team have considered your suggestion, but they rejected it for the following reasons:

TOLORS wrote:

6.1 Delete or edit your comments everywhere

The inability to delete your comments everywhere is put in place so users do not post inappropriate comments or spam comments on other users' profiles, projects, or studios, just to delete them later on. In contrast, you are not really likely to spam your own projects or profile. The only benefits to this are to remove comments that you did not mean to post and to fix spelling errors. The former could be solved by thinking carefully before posting any comments, and the latter could be worked around by typing slowly and/or stating your mistakes in a reply to the comment. This also applies to forum posts; that is, a feature for Scratchers to delete their own forum posts will not be implemented.

Editing comments could similarly lead to comment manipulation, such as a user commenting “I like this project,” waiting until someone replies with “I agree,” and then editing the original comment to say “I hate this project.” Allowing Scratch Team members to view the edit history of a comment does not make it easy to moderate, since then they have to look carefully at the context of each edit, which takes time.

Next time, before making a suggestion, read these topics:

• The Official list of Rejected Suggestions (TOLORS)
• Constructive Recommendations On How to Respond to and Make Suggestions!
• Guide to the suggestions forum
• Guide to Finding Duplicates
• How to give helpful suggestions about Scratch

Oops… 9 seconds too late