In lieu of an official Tinder app for Windows Phone, 6tin is the best way to access the hookup service on your device.
6tin shows you people in your vicinity who you might be interested in meeting, based on criteria you can define yourself. You can then view these people and choose to 'like' them or 'pass'. If you 'like' them and they like you back you can start messaging the person.
It's a handy client with some useful options, notably the ability to go back to people you passed on before.