You only have one account across all of *.codidact.com, so you can't delete it on a per-community basis. See for example the fact that your user ID (number) is the same on all sites, and that the login credentials are the same on all sites.
However, if you simply no longer want some content to be associated with your account, that's probably something a developer can do. (I know something similar has been done when people have requested all-out account deletion, so I can't imagine it would be impossible to do on a per-community or even a per-post basis.) If that would be sufficient for you, flag the relevant posts for moderator attention, and make the request in the flag.