Originally Posted by
cblaisd
As I say, the website looks incredibly technical
That it is... Basically you want to request a DID (Phone number) and then when that is provisioned you can go to DID Numbers menu --> Call Forwarding and create the forward rule. Then go to DID Numbers --> Manage DIDs --> Check the box next to the numer you've set up and click on Edit Selection - All Settings at Once. In the list there will be a bunch of options with dropdown selections. Find Call Forwarding in the Routing section and select the rule you created earlier. You can create multiple rules and toggle them here.
Hope that helps.