Under the Get Credits menu, click on Buy WGT credits. Don't worry, you don't have to make a purchase. From the buy credits menu, look for the link for Transaction History. Click on this link. Then, to find the gift quickly, hold Ctrl and hit the F key to bring up your browsers search function. Type in gift and then search, and you should see something like "Received WGT GI-2S as a gift from user 'username.' That should tell you who sent you the gift.