To access the configuration settings for RD Web Access, log on to the RD Web Access Web site by using either the local Administrator ...

To access the configuration settings for RD Web Access, log on to the RD Web Access Web site by using
  either the local Administrator account of the RD Web Access server or an account that is a member of the TS Web Access Administrators group
  on the RD Web Access server. Then, on the title bar of the Web page, click
 Configuration.