Click it & you will be taken to the GIFTS page, where you will see the options: Send Gifts, Receive Gifts, Rallies & Accept All.
You will be able to send and accept all your Gifts from here. If you want something, the best way to get it is to either request it from your friends, or even better, just send it out as a gift to people on your list. They will return the favor shortly!
You can only send out 1 gift per neighbor in a 24 hour period.