https://s3.dualstack.us-west-1.amazonaws.com/remove.reddit.post/remove-comments-from-reddit-post.html

Can't delete Reddit post

Scroll through your posts until you find the one you wish to delete. Next, click the three dots on the post, and a drop-down menu will appear. Quickly delete all your comments and posts from Reddit, or use filters to remove content by Subreddit, karma, post age, and more.