iCloud Photo Library and iCloud Drive store all your media files and documents. To sign in to your iCloud, follow the steps mentioned below:
On your iPhone or your iPad:
Go to “Settings” > “iCloud”. Then enter your Apple id and password.
On Mac:
Go to “System Preferences” > “iCloud”. Then enter your Apple id and password.
In case of any doubt in the solution of the problem you can also visit Apple Customer Care number
here.