When posting a new topic in Google Groups, I made a few misleading typos that I wanted to correct, but I couldn't find a way to edit the post. Is it possible to edit a post in Google Groups (in case I need to correct something in the post?)
If you are the owner of the group then do the following:
You need to go to Manage → Permission → Moderation permission. There change the Edit other's post and Own Post. Save.
If you are not the owner, ask the owner to enable edits by following the steps above.
Once the message is posted it cannot be edited. https://groups.google.com/forum/?fromgroups=#!topic/gmail-generation/7W51BDOBWIg
(Desktop in 2018) When viewing the post, in the upper right corner is a Reply button with a pull-down arrow for More Message Options.
Note: You'll see this option only if you are among the Select Groups Of Users allowed to Edit Others' Posts in Moderation Permissions (see a previous answer above for how to change that).
Pull down More Message Options and choose Edit.
You'll see a text link to Edit Subject.
Yes you can I 've just done it. Go in your first text of the thread. click arrow on top right corner of the message: edit. there you can edit subject. and the whole thread subject changes!!. Must say I am owner and the one who started the thread.
My experience in 2017 is that the only the person that wrote a Post can Edit it.