I know JU has been wonky of late and many are finding that when they log into their blogs they don't have the edit feature available to them. I have discovered a way to get that edit button back, at least using Firefox.
I log into my blog. Normally the edit feature is missing. I will close the browser and immediately reopen it so that I am still logged into my blog (you have to be quick). Voila! The edit feature is now available to me. Sometimes I have to do this a couple of times, but it eventually works and the edit feature is there.
I don't know if this will work with IE as I don't use it.