cancellation of F1 student visa

[colekata]

I received my F-1 student visa in July 2015 and now it's Jan 2016.

I tried to travel but had to cancel three times.

Finally I have decided to cancel the old visa and apply later for a new one (with a different uni, of course).

Could you please guide me or provide me a reference link on how to cancel my visa?

I need to understand the whole procedure.




Thanks in advance

Babu from Kolkata