I can't configure my Terminal Adapter card for 2 lines.

If you are using the TA Configuration Wizard and have trouble making changes, then try this procedure:
Send the command AT@CONFIG<enter>.
Configure the MSN options if the customer wants to do call filtering.
Send the command AT!L<enter>to check the configuration in the ISDN modem. It will display the ISDN parameters settings.
Make sure the settings are correct for the ISDN line connected to the Modem."