Eredan iTCG How to Use XP Cards Guide by JarodG64
Here is how to use XP cards :
Click on the card to which you want to add XP.
Then click on the symbol to get to the evolution window.
If you have some XP cards they will appear on the right side of the window.
Drag the XP card you want to use onto the card you wish to add XP to and when asked validate your choice.
NB : If the card you want to add XP to only lacks say 15 XP to get to the next level and you use say a 50 XP card then you will lose 35 XP. The excess XP IS NOT added to the next level.