A You can delete comments and block users from posting comments by following these steps:

1. To delete a comment under your own artwork and block comments from that user
・Open your artwork in the Online Gallery.
・Swipe to the comment you want to delete and tap the “×” button in the upper-right corner.
・A dialog will appear asking, "Are you sure you want to delete this comment?"
・Select "Yes" to delete the comment.
・After that, a dialog asking, “Would you like to block comments from this user in the future?” will also appear.
・Select "Yes" to block the user’s comments.

2. To block comments
・Go to the user’s profile page and tap the “...” menu next to their profile name.
・Select "Block comments".
This will block all comments from that user.
＊You can unblock comments the same way.