In Dianara, I can edit my own posts, which is different from deleting and reposting.

Newest version of Pumpa has ability to edit posts. Should be in Debian sid very soon :-)
Comment by sazius [id.mayfirst.org] Mon Aug 25 20:50:12 2014
Yes, but for an HTML post, it's a plain HTML code editor.
Comment by aleksejrs Tue Sep 2 13:48:04 2014
Yes, that is unfortunately harder to fix. Pumpa uses Markdown for formatting, and posts are stored as HTML in pump.io. I would need to convert back from HTML to Markdown in order to do that, and that's more or less impossible or at least extremely error prone.
Comment by sazius [id.mayfirst.org] Thu Sep 4 19:43:29 2014