First request a login for your area or areas. Then fire up the meeting editor at https://bmlt.wszf.org/main_server, and start editing or entering meetings. The BMLT documentation has details on how to use it.

Have a web page set up to display the meeting data for your area or region — then you can check that the meetings you are entering are showing up as you want them to. (Remember to refresh the display as you go.) See Displaying Meeting Data for how to set up the display.