How do I edit/ change my Phone number on my messenger to use it for IM?

I just changed my phone number %26amp; needed to use my messenger asap through my phone. Thanks.How do I edit/ change my Phone number on my messenger to use it for IM?
go to messenger on your computer and click on preferences. There under ';general'; look to the bottom of the window to the right and you will see ';edit mobile device';