As far as I'm aware Citrix is basically an online portal to access applications. I only know this because we have to "go through Citrix" here at work for certain applications.
You wont be able to connect to your work place citrix with out your IT department first setting an exception for your device, they most likely have it secured, you will also most likely need to be on the correct network or VPN'd to the correct one.
Goto meeting on the phone obviously only allows you to view meetings and connect to them using the meeting number.