Ok squeeze you Vigina right now... that is how you do it. I am not joking at all it is that simple. There are surgeries you can do as well but I dont know what kind of case you in to why you want to tighten it. You can do a simple google search and find many different site on getting yourself tight but in general most of them just come down to the simple task of you contracting and relaxing you vigina.

You do this 20-400 times a day if not more. It all depends on hwo strong your muscles are right now. jsut do it all the time basically. When driving your car, sitting at work. It is somethign you can do all teh time and no one knows it but you. There are several different thing you can get like cones and what not to work different adn certan muscles but over all they are jsut doing the same thing in a different degree. Jsut keep squeezing yourself and you will be tighter. Here is a quick site I found that may help.