You will be notified of two logins to your WordPress account.
One will be an ‘editor’ account for content changes.
The other will be an ‘admin’ account affording access to everthing.
Under normal circumstances you will only need the Editor account.
The Admin account may be used to change the Editor account.
If you forget your Admin account then password may be recovered via your email address.
Login is via www.yourdomain.name/wp-admin