Q: I've put the wrong id in my phone and cannot link to iCloud.I cannot change id on my phone

Howdy Malcolm,

It sounds as if you need to sign out with the incorrect Apple ID and sign back in with the correct one. You can do that by following the steps in this article -

Sign in with a different Apple ID on your iPhone, iPad, or iPod touch - Apple Support

Go to the section titled iCloud.

Thanks for using Apple Support Communities.

Best,

Brett L 

You are welcome, glad to be of assistance.

Brett