How can I purchase iCloud

How to upgrade on your iPhone, iPad or iPod touch

1. Go to Settings > [your name] > iCloud > Manage Storage or iCloud Storage.
2. Tap Buy More Storage or Change Storage Plan.
3. Choose a plan and follow the onscreen instructions. 

How to upgrade on your Mac

1. Choose Apple menu  > System Preferences, then click Apple ID.
2. Click iCloud.
3. Click Manage in the bottom-right corner.
4. Click Change Storage Plan or Buy More Storage, and choose a plan.
5. Click Next and enter your Apple ID password.