Click on "PBX," then click on the "Incoming Calls" tab. Click on "IVR" from the drop-down menu.
General section:
Click on the "Entries" tab.
Click on the "Add" button for each additional key press option.
Click on the "Save" button when you're finished.
Then click on the reload icon on the top right corner of the screen.
Click on the menu label in the upper right corner of the IVR General Settings.
Click on the IVR you just created.
Click on the "Relations" tab.
You can see if there are any sources or destinations for your IVR, if any exist.