PFE does not have any STARS ...it will only use the flight plan you create.
I have created a plan using
http://rfinder.asalink.net/free/autoroute_rtx.php and
http://www.simroutes.com/fb2/details.aspx. By selecting the Korry3 STAR on the latter site it gives me all the waypoints of that STAR. Then save the plan as a FS9 .pln file..... the open it up in FS9 select an altitude and save. Open the .pln file in PFE and compile a flightplan. Then you can adjust the altitudes on the STAR. It wont have all the waypoints as there are many very close together.
You can then fly the routeand before you start you can decide how you want ATC to interact with you.
1. If you want to fly the STAR yourself you can select GARED as the start of STAR and you will be told by ATC to fly it. You will then be vectored from APPLE the last waypoint.
2. If you want to be given ATC instructions through the STAR then dont select a start of STAR and you will be given ATC instructions as you fly it and will be vectored from APPLE.
3. If you dont want to be vectored from APPLE, then on the SIDS/STARS page select KLGA and tick the box for STARS active (automates cleared to finals). You should then be cleared from APPLE to continue approach at your discretion. APPLE is very close to the airport and this may create issues, so make sure you have a sensible number in the SIDS/STARS page for minimum FAF altitude... say 5000 if you dont expect to land on RWY04....if you are expecting 04 then 3000.