The first step is to ensure the Portal Access service is installed on the RMAD server, which is done from the RMAD installer.
You then need to install the RMAD Portal by running its installer from the RMAD Autorun. Once the installation completes and you click Finish, the Quick Configuration Wizard should start allowing to you to configure the Portal settings. If the Quick Configuration did not start you can configure the required settings by using the steps found in the User Guide under the Configuring portal for working with Recovery
Manager for Active Directory section.