How to downgrade your iCloud plan on iPhone 6s

Hello ghana,

Click on the link to read how to downgrade or cancel your iCloud storage plan using an iOS device, a Mac, or a PC. --> Downgrade or cancel your iCloud+ plan - Apple Support

I'll copy the section to you here but it will probably be easier to read on the link I provided.

How to downgrade or cancel your iCloud+ plan on your iPhone, iPad, or iPod touch

1. Open the Settings app.
2. Tap your name.
3. Tap iCloud.
4. 
   
5. Tap Manage Account Storage or Manage Storage.
6. 
   
7. 
8. Tap Change Storage Plan.
9. 
   
10. 
11. Tap Downgrade Options and enter your Apple ID password.
12. 
    
13. 
14. Choose a different plan:

• • To downgrade your plan, choose a new storage amount.
  • To cancel iCloud+, choose the free 5GB plan or choose None.

1. 
   
2. Tap Done. If you can't tap Done, make sure that you're signed in
3. with the same Apple ID that you use for your iCloud+ plan. You can also
4. try following these steps on a different device. If you still need help,
5. contact Apple Support.

If you downgrade or cancel your iCloud+ plan, the change takes effect after your current subscription billing period ends.1