MIDI Envelopes in Cubase 5

Hello everyone,

I’m new to Cubase and was previously using Acid Pro and im using Cubase 5.

I just have a problem, can anyone please guide me on how to use a volume envelope on a midi track? Because on Acid pro its easy where I can simply insert it and adjust the levels through out the MIDI track, but on Cubase 5, I can do this to a Audio Track, but can someone guide me on how to do this on an instrument track?