Depends on the type of tablet you have, be it an Android or Apple, however the process is very similar. You will need a laptop with Bluetooth functionality, if you don't have one with it, then you can buy an adapter and plug it into your laptop and install the drivers for it. You will also need to setup file sharing, etc on the laptop. After that, you'll have to turn on your tablet and go to it's settings area where it allows you to connect to bluetooth devices and you then search for your laptop on the bluetooth device list and attempt to connect to it. You will then have to accept the request on the laptop and then your devices should be paired.
For a guide on this with Android see here.
