HELP! I'm totally ignorant about what I'm supposed to do when I receive a gift! I tried to click on what I thought I should. Know what?

The gift giver disappeared and I don't know what I should do next.

What is the gift giving all about? What's its purpose?

Thanks in advance for whatever light you can shed and apologies to the gift giver for losing her. I didn't mean to do that. AARRGGHH.