How do I change my apple ID from icloud email address to another?

See this Apple article: Change your Apple ID

Change your Apple ID - Apple Support (SG)

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

How do I change my apple ID from icloud email address to another?

How do I change my apple ID from one icloud account to another?

So clearly you did not start a clearly start post.