tswmpg
cannot check app update
What do you mean? If you're saying that there was an error once when the App Store app checked for updates, that's fairly common. You may have bad connectivity or there may be an issue with your VPN or Tor if you're using that. If it happens once, I wouldn't worry about it. If it happens all the time then some troubleshooting may be necessary.
I want to add here that everything I did was asked to repeat again. I had activated this account but I was asked again to activate again. I clicked on that link but it said this confirmation linked had already been used.
Not sure what you mean by you had to repeat again. Confirming emails when registering an account is pretty normal.
tswmpg "you do not have permission to do that"
You probably tried to edit the post too long after it was posted. I think you have 10 minutes to edit posts.
tswmpg you have not save your changes, do you wish to discard them?
tswmpg There is no button for saving the changes.
If you can't edit the post, you can't edit the post. You can just accept that changes weren't saved. There's no feature to save drafts on Flarum (this website's software). I suppose there may be an extension that can offer that functionality, but we clearly don't have one like that installed.