Server Manager requires an identifying username and password to successfully log in to its system. The hosting provider should provide these details to you. To login to the site GUI do the following:
Open up a browser and go to http://servermanager.westhost.com/.

You will be redirected to the login screen. You will need to enter your Server Manager username and password in the corresponding fields. Press the LOGIN button to confirm the data you entered and login to the Server Manager.
