How do you catch Pokemon in Pokemon GO?

When you see a Pokemon on your screen nearby or in your location, tap on the Pokemon, then flick your finger upwards on the screen to throw the Poke Ball when you are in a "battle" with it. Sometimes, the Poke Ball can miss, but it'll allow you to try again. When the Poke Ball absorbs the Pokemon, it'll need to shake three times before a click to capture it.