Hello Nanny76,
It sounds like you want to know if you can change the email address for your Apple ID/iCloud account, correct? We'd love to provide some information.
When did you initially create your iCloud account? "If you try to change your Apple ID to an @icloud.com email address that was created within the last 30 days, you will be asked to try again later."
You can find more information about changing your Apple ID here: Change your Apple ID
If you want to change the email address that friends and family use to reach you, you can add an additional email address to your account. You can find more details about that under the "Additional email addresses" portion of this page: About your Apple ID email addresses
Thanks!