How do you type accents on computer?

It depends on what you mean by "accent". If you mean how to type a British accent on a computer, well, it isn't exactly possible. You don't "type" accents. You have to speak accents.

Otherwise, if you mean something like ñ, you use the Alt key and the number pad on the keyboard. For the n I just typed, press down "Alt" and type 164.