I bought more iCloud storage but don’t know how to access it.

Hi devonne115,

Welcome to the Apple Community, where some of us do our best to help each other :)

Wondering what device(s,) or Mac you are wanting to access iCloud storage from.

There'a a discussion thread on a similar topic that may help you if you are using iPhone..

https://discussions.apple.com/thread/252671356

or Apple Support have articles online to help:

Set up iCloud on your iPhone, iPad, or iPod touch

https://https://support.apple.com/icloud

Set up iCloud on your Mac

https://support.apple.com/en-au/HT208682

What is iCloud storage?

https://support.apple.com/en-au/guide/icloud/mm7983cbca2a/icloud

Manage iCloud storage on Mac

https://support.apple.com/en-au/guide/mac-help/https://support.apple.com/en-au/guide/mac-help/mchle5a61431/11.0/mac/11.0

Use iCloud Drive to store documents on your Mac, iPhone and iPad

https://support.apple.com/en-au/guide/mac-help/mchle5a61431/11.0/mac/11.0

iCloud Support

https://support.apple.com/icloud

Hope what you need is somewhere in the above. :)