Hi,
you need to get the source code for your old channel from the developer, and change the address, repackage and submit the channel as an update. If you can't obtain that source code, you need to recreate the channel from scratch or hire a developer to do so.
One thing to look into though is if the channel uses an alias or a fixed ip address where it gets its data - if it uses an alias, then you may be able to recreate the alias on your new platform and use the same alias, for example if the alias was
mydatasource.myservice.com
and you've moved myservice.com to another provider, you need to recreate the mydatasource alias on that domain on your new host.
- Joel