How to remove your Reddit account
Deletion somehow does not work in certain languages other than English (bug). So, if the removal is not confirmed, go to preferences and switch to English as the interface language.
Direct removal link: https://www.reddit.com/prefs/delete/
Helpful Trick: Removing online data
Publicly visible text/images often aren’t properly removed even when you succeed in removing an account. Try editing or removing them manually before removing the account itself. If you’re unsure what happens to your tracks: this can be found mostly in the Terms of Service/Privacy Policy; otherwise you can always contact Reddit and ask personally. By the way, removal requests don’t necessarily mean your data will actually be removed (e.g. due to legal obligations).
Helpful Trick: Remove third-party logins
If you signed up for Reddit using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Reddit. Click here to find out how.