Click Done to close this window. This will bring up the modem properties menu and you will need to select which modem you are going to use. For most users, this is the modem you just installed. It should be in the drop-down list under the appropriate manufacturer. Just find your modem or closest model on the list and select it.
Most modems are very similar within the same brand.
Also, choose the appropriate Serial COM port. You may also choose whether to enable a Terminal window during your connection so as to see what is happening directly inside your modem. This can be useful in troubleshooting and finding out what is wrong and where things are failing. I also recommend you turn on logging of your connection. Make sure that you select the correct connection speed since that might make a big difference in the overall performance of your connection.