1. Login in to your MainWP Dashboard
2. Go to the MainWP > Extensions > Comments page
3. Select wanted Child Sits
4. In the Search Options section set your search preferences
5. Click the Show Comments button
6. Once the list of found comments appears
   1. Locate the Comment you want to trash
   2. Click the Trash action in the actions menu

Delete Comment Permanently

Since WordPress allows you to permanently delete only comments that are currently in Trash, before you can permanently delete them, you need to send them to Trash. Once they are in Trash, the Delete Permanently action will be available.