Well first of all if you don't get it... LOOK IN THE INSTRUCTION SHEET THAT'S WHAT IT'S FOR!!!!!! And if you STILL don't get it, then either:
1. Give it praises when it's in a bad mood (back facing screen and little puff ball above head)
2. Praise it when it is crying
3. Give it a time out when it won't eat but it is hungry
4. Give it a time out when the attention icon lights up and nothing is wrong
5. Give it a time out if you are connecting and you wrapped a present but it gave a bad present instead (you will be able to tell because when it comes back from the other tama's "house" it will have a little smug look on its face)*
*Only happens if you just connected