Step 1 of 8: Create an iCloud account on your Mac or iOS device

My Photo Stream is a great way to view your most recent photos on all your Apple devices, and a quick and easy way to back up photos to your Mac.
Photo Steam can be used without turning on iCloud Photo Library, which arrived with Photos for Mac and will allow you to store all your photos - but you will have to pay if your library is more than 5GB in size. If you want to use iCloud Photo Library instead, this article should help.
For Photo Stream to work you’ll need to have an active iCloud account. Usually you’ll create this when setting up a new machine, but if you skipped that part it’s easy and free to open one now on your Mac or iOS device.
On your Mac click on the System Preferences icon in the Dock, then select iCloud and simply enter your Apple ID. You’ll be given a few settings to enable, just make sure that you click on Photos and ensure the My Photo Stream box is ticked.
To create an account on an iOS device go to Settings, iCloud, and enter your Apple ID.