can we get a way for the person who wrote the comment delete it and for the creator of a studio to delete them

Rejected.

The Stickies wrote:

7. Delete your comments on other peoples' projects
This is so that people can't post troll comments and then delete them, while you aren't likely to troll people on your own projects, studios, or profile. On the forums the solution to this is that you can only delete posts 24 hours after they have been posted, and deletes are not permanent (although I don't think they're permanent for comments either).

Please read the stickies before you post. They can be very helpful.
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Also, next time, please describe your suggestion better. Why should this be added? What would it look like? How would it improve Scratch?
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Reporting to be closed.