When you point up the ring finger, also known as digitus medicinalis, it means I like you in a friendly and non-rude matter, or can have alternative meanings, like "your awesome", I love you to a romantic partner, etc. This is not to be confused with the middle finger that means "GO F--K YOURSELF"
Pointing Ring Finger Up Like Middle Finger except it's the Ring Finger:
Jessica: That was such sweet gift Howard *points ring finger*
Howard: Aww you put your ringer finger up! I love you too!