If you need to access a recorder but forgotten the password then you’ll need to recover it. To recover a password for your system then all you need to do is follow this video tutorial. So long as a password was set beforehand this will be simple. If not, there are still options including answering security questions. This will only get you access to the admin account but from there any other account can be removed or created.
So make sure to setup a strong password every time, even if you are worried you might not be able to remember it you can always get a way to recover it.