I want to turn on my iCloud

Can you elaborate your issue, also refer to the below given steps if your issue is mentioned

• iCloud.com works best on Safari for the latest versions of iOS, iPadOS, and macOS, or on the latest versions of Firefox, Google Chrome, Edge, or Opera for Windows.
• If you don't have an iPhone, iPad, iPod touch, or Mac, you can still use features included with web-only access to iCloud by visiting iCloud.com on a computer or tablet.
• Learn how to recover deleted calendars, bookmarks, or contacts from iCloud. 
• Learn more about the system requirements for iCloud and iCloud.com.