How do I remove iCloud storage charge from my account

Do you want to manage your iCloud storage or do you want to downgrade your iCloud+ plan?

See also the following Apple articles:

How to use iCloud on iPhone -> How to use iCloud on iPhone – Apple Support (UK)

Manage your iCloud storage -> Manage your iCloud storage - Apple Support

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See this Apple article: Downgrade or cancel your iCloud+ plan

Downgrade or cancel your iCloud+ plan - Apple Support (PH)

or

Check your mail box and click the last Apple invoice you have recieved for you iCloud+ plan. 

Then scroll down & see:

👉 If you have any questions about your bill, contact support. This email confirms payment for the iCloud+ plan listed above. You will be billed each plan period until you cancel by downgrading to the free storage plan from your iOS device, Mac or PC.