Garmin/Apollo GX60 Change IAF?

[WebRuss]

Hey All - Anybody here really knowledgeable about the Garmin Apollo GX60? I am confused about changing a IAF on an approach. For example if I load the GPS 23 approach for X35,(link to the plate below) the IAF is ALADN, which is the only IAF and is due west of the airport. When I come from the north, ATC often sends me directly to the OCF VOR IF instead.
I cannot figure out how to change the GPS to tell it I want to start the approach from OCF VOR IF instead of IAF ALADN.

I've read the manual up down left and right, but I must be missing something.

Thanks in advance for any help you can offer.
Regards
Russ

http://skyvector.com/files/tpp/1502/pdf/09138R23.PDF

 

[mrserrano]

 

[sigmatau]

 

[WebRuss]

 

[philiplane]

 

[mv_myrx]

 

[RNC]