You shouldn't have to input the CID - the script handles CID selection for you. All you should have to specify are the APN (which goes in the Phone Number field), username and password.

If you open the Bluetooth connection in Network Preferences, your should be able to enter those values. You can also check you have the right modem script installed by clicking the Advanced... button and looking at the Modem tab of the advanced preferences.

Hope that helps!