first you have to mix the substance being adminstrated with water, draw the suspension up into a needleless syringe, lubricate the syringe with vaseline. Lay on your side with a towel beneath you, and slowly push the syringe 2-3 inches into the anus. Slowly administer the liquid; too fast and it will squirt out your arse. Slowly remove the syringe; too fast and the liquid will squirt out your arse.
Lay on your side afterwards for 5-10 minutes or else the liquid will squirt out your arse
Throw away the syringe and wash your hands.