That depends on what tablet you have. There are so many different ones. There's Apple, HP, Cisco, Blackberry and several flavors of Android.
http://www.google.com/search?q=iphone+ipad+tether tells what to do if your tablet happens to be an iPad. I leave it to you to ask google if it's a different tablet have.
have a 4g iphone how can i access said 4d to my new tablet without adding payment to the distributor