Well, you have come to the right place then. In this post I'm going to show few easy and simple steps to activate your data sim. (This is for UK only)
1. Insert the sim and then got this site http://add-on.ee.co.uk
2. After visiting the site you'll get two options,
a. Click below to complete your registration.
b. Click below to get online.
Choose the option b and click on the "Activate" button.
3. That's it you are done. Now you can enjoy your internet. :)