You can put it under your tongue and let it melt there, or the roof of your mouth or somewhere between. It comes on more gradually than snorting, and the come down is more subtle too. Not much difference in duration. It also produces a strong anesthetic feeling around the lips, on the tongue and around the teeth that way, which is considered as pleasant by some.
Good cocaine goes through membranes very easily, it even can be absorpted through the skin if there's sweat on it, also under the foreskin it gets into the system quite effectively. (Hence the hours of porn you can have) though your impulses are less sensitive and less susceptible for joy.
I wouldn't suggest swallowing it. It's not going to be a favor to your stomach and you might waste your expensive material for less desired effects.