I have not been able to edit my posts, lately, and I cannot sign out of my account. The site was not working a while back, and since then (??) it has not been fully functioning, for me. Win10 with Firefox
Hmm .. I'll have to try it on my laptop here.
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Just posted the sentence above (^) and am adding this comment. Seems to work for me. Maybe try with Opera, Chrome or (shudder) Edge?
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After posting and editing, I logged out, went to another website and then came back here and re-logged in. Log-in was fine and am editing my post again. Sorry, Neil - I'm not being much help! I use Chrome (rarely Firefox or Opera - never Edge (unless forced)).
Good luck!