To send gifts to your neighbors in City Girl Life, open the game and click on the Free Gifts tab at the top of the game. This will bring you to a page that lists all available gift items.
To send Neighbor requests to your friends, click on the Invites button at the top of the game. This brings you to a page that will allow you to send neighbor requests to your friends. You will want to become neighbors with as many friends as you can because you will need a certain number of neighbors to unlock items and other content in the game. You can also visit the apartments of anyone you are neighbors with to earn more rewards.