How do I edit the phone number associated with my iCloud and iMessage account.

Hi All,

I recently synced my moms phone onto my MacBook and this has effected my iCloud,Facetime and iMessage accounts on my Mac,iPad and iPhone. When I look at preferences on iMessage and facetime, it lists my moms phone number, how can I edit that phone number to be mine ? We are both on the same iTunes account.

Thanks