Taken from GE IAH article: http://ge.iahgames.com/en/news/?aid=253&sec=1&ssec=4

A Guide To Activating Your G-Points: G-Points & Game Time Top-Up

1. Click on the “Top-Up” button and choose the game you wish to top up to.

2. Enter the Game Value Code and Game Value Password into the field provided.

3. Select the Game Value you would like to add and the game world that it goes into. If this card comes with a bonus item, you will be asked to make your choice now.

5. Top-up successful. Have fun!