Upgrading my extension

Some years ago I created and published a little extension “Last touch” it is cold. some weeks ago somebody asked me to add a simple option to it and I would like to update the rb file.
Is it possible or I have to publish it as a new version of the extension…
I mean at first I noticed edit option in MY Extensions but it does not allow to do any changes to actual extension files…
Maybe I am just using wrong wording but I was searching for the answer and couldn’t find…

I’m not very familiar with the publishing steps, but look to see if you have an option to make a new Draft.

aa… in my mail box draft is used for an email which You started but had no time to finished… so I was not sure about this one… there is this option, will try it, thanks…