Change your windows account password.
To log into the Cisco TMS web application, users must have a Windows username and password that the server is configured to trust. By default, any local Windows user account will work, as well as any Active Directory domain user account if the server is a member of an Active Directory domain. The first user to sign into Cisco TMS is automatically made an administrator and will have full access to Cisco TMS
TMS does not have/store any passwords, it just uses the underlying authentication available on the Windows server it's sitting on, whether that be a local account or a domain account if the server is on a domain. If you know the name of an account that has the rights you need in TMS have the Windows admin change the password of that account and you should be good.