Use APM to SSH....

We are new to APM and have the need to configure a way to allow our users to login to our APM SSL VPN site and then select a system to SSH to. I believe this would be accomplished with an App Tunnel. I have tried to configure one of our inside servers for this but I am not sure I am going down the correct path. Can anyone point to to a article that will walk us through this process, like at a 101 level. Most of the stuff I am finding is more advanced than we currently are with APM. Any assistance would be appreciated.