You need to do that with your Domain registrar account. Not sure which Registrar you are with, but most of the good ones do it the same. Here is an example of a tutorial on how to do it. I'm sure if you Googled this for your Registrar that it would come up with a tutorial specifically for your Registrar. Otherwise ask your Registrar.
Unfortunately that isn't something we can solve. We can provide advice as per above, but the actual forwarding happens in your account with your Domain Registrar. If there are issues with it you need to take that up with your Domain Registrar.