You need to share more information. If, in fact, you need a new password, that is only available from your email provider. If you do have a password, it is possible that someone here can assist after you explain your situation and your server settings for input and output in detail. usually, screenshots of incoming server settings and output server settings are the most help.

What do you mean by "re-activate" and (in your other message) "re-set"? What is the problem? What would you like accomplish?

Oh, sorry, I see that you did mention a password in your subject. I defer to David.