How do I train a Tamagotchi?

One way to train your Tamagotchi is to take it to the toilet just before it is about to poop (which is when you see "stink lines" above its head and it looks like it's wiggling). Another way is if your Tamagotchi calls you and it doesn't need anything; click Time Out, which is one of the options when you select the symbol that looks like Pac-Man. The final way to train your Tamagotchi is when it looks sad or is crying. You need to go to the Pac-Man symbol and then click on Praise. Your Tamagotchi will instantly cheer up, and all three of these methods will increase the training meter by a few bars. The training bar will never go down over time.