1 of 2 ways:
1. Push the Remote Agent from your Backup Exec server. Under Job Setup, your selection list, go to your server, right-click it and choose :Install Remote Agent/Advanced Open File Option...". If this fails (sometimes fails and tells you that you have to restart your remote server before a further installation is possible!)...
2. Log on locally to your remote server, and browse to your server's installation directory for Backup Exec. Double-click "browser.exe", and click OK until you get to the splash screen. Once you get there, select the option to install the Remote Agent locally. If you install AOFO, you will probably need to restart your server.