How do I access my iCloud?

Sign in with Apple ID and password in iPhone Sign in with your Apple ID - Apple Support

And turn on apple inbuilt applications Sign in to iCloud on all your devices - Apple Support the iCloud data saved from applications will sync .

There’s different ways.

You can log in to https://icloud.com with your account, or log in on a device o Mac, or download iCloud for windows to. Windows PC.

What issue are you having exactly?