Are you talking about your Hub Login Security username or your My Hubitat (my.hubitat.com) account? I'm assuming the former? That is the kind that would prevent you from getting into the hub in the first place.
If so, I'm not sure what instructions you found (links are always helpful), but these look up-to-date to me:
If you don't see Advanced, make sure you're going into Hub Details first, as mentioned.
Or if you're talking about your My Hubitat account, the first thing I'd do is make sure case matches (there is/was an odd issue with case sensitivity in the e-mail/username).
