5 repetitions of "Guru guru wahe guru" on one breath. 108 repetitions. Or start with 26 or 54 to begin with.
Sitting position on floor, couch, chair, or bed with arms relaxed in lap. You can even use the hand mudra of thumb pad and forefinger pad touching, arms relaxed on top of legs.
This mudra is known as the gyan mudra. Whatever position you feel best in.
Enjoy.