First, what operating system are you using? This is always important! If you don't tell us what OS you're using, we can't help you.
Second, what steps have you taken so far? And have you been reading the manual carefully?
Third, please improve on your English usage. There are many users on these forums who either: A) are visually impaired and rely on screen reading software, or B) don't speak English and rely on translation software to read the forums.