You can assign roles to a user when they are created or by editing an existing user. When assigning role to a user you must decide whether you want the user to have this role on all build servers connected to the current management server, or just on the selected build servers.
Role
Select the role which you wish to assign to the current user. You can only select roles which have not already been assigned to this user.
Apply to Servers
Choose whether this role should be assigned to this user on all builds servers or just on the ones selected. The build servers which have already been connected to the current management server will be listed, if the server is not listed then you can type the host name of machine which is hosting the build service.