i forget my icloud

iCloud uses your Apple ID and password. If you only have one Apple ID, it would be the same ID and password as you used to log into this forum. If you have another and have forgotten the ID or password, see the following:

If you forgot your Apple ID - Apple Support

or

If you forgot your Apple ID password - Apple Support

Depending on 1) whether you forgot your apple id or just the password and 2) what apple device(s) you own, this blog will help guide you through your possible options:

https://www.idownloadblog.com/2019/02/06/forgot-apple-id-password/