You need a web browser to access the user interface of Teamwork Cloud Admin (TWAdmin). If you do not change the configuration settings, you can access the TWAdmin from its default location https://<machine ip>:8111. For example, if the machine IP on which you installed TWAdmin is 10.1.1.123, you can access TWAdmin from https://10.1.1.123:8111/ (the default port is 8111).
If you change the default configuration settings with new values, you have to type those values into your web browser when attempting to connect to the server. The default administrator's username and password are both Administrator.