The Abbey is located near the village of Garvald, about 30 minutes form the outskirts of Edinburgh.  The nearest large town is Haddington, which lies just of the A1.  Follow signs for Garvald then turn left up the hill once you are through the village.

Google maps>>> 

Please note that, while the map location does point to the correct place, the associated photos in google maps are not of the current buildings.