I think the question was:
In reply to:
Do you need to go back into the proc page to activate the approach or will it do it automatically.
It’s been my experience that you need to activate the approach, making sure that you toggle the CDI from GPS to VLOC. Press HDG and NAV together, with ALT selected, and use the HDG bug to guide the airplane to the final approach course. When you get close enough to the final approach course, hdg will extinguish, nav will stay lit, alt will stay lit and approach will illuminate. You will now be tracking the final approach course. As long as you are far enough below the glideslope, and far enough from the FAF, you will also capture the glideslope. When that happens, alt will extinguish, VS will illuminate and GS will illuminate. Reduce RPM, one notch of flaps, and GUMP at the FAF, then enjoy the ride down.
Watch your DH, because the AP will fly you into the ground. That’s it. It’s an awesome combination of equipment.