You can update your admin email address, just reach out to the partner team at [email protected] and we'll make the change for you. Once it's updated, you'll sign in going forward with your new email address; your password stays the same, so there's no need to reset it or re-activate your account.
If your account is further along (for example, you've also enrolled as a client or already have clients set up), the update can take a little longer while we make sure everything stays correctly linked. The partner success team will walk you through it.