Hi, can I check what you have been able to do so far, and any problems you have run into?
Do you want to run Bridge Command and OpenCPN on the same computer, or on different ones?
By default, Bridge Command will send NMEA data over UDP on port 10110 to localhost (i.e. the computer Bridge Command is running on). You can change these settings in the NMEA tab of the Bridge Command 'Settings: Main' section.
In OpenCPN, you can set up the incoming connections as shown in https://opencpn.org/wiki/dokuwiki/doku.php?id=opencpn:opencpn_user_manual:options_setting:connections
If you can let me know any specific questions or problems, I may be able to help more.