1.) Download BDBZM client from here. (Latest version: 1.40 436KB).
BDBZM Download

2.) Once downloaded, extract it into it's own folder. Inside will be the program you will use: BDBZM.exe.

3.) Run BDBZM.exe, you should see this (reference first picture). 

-1- Click the third tab.

5.) Now you should see this (reference second picture).

-2- For the first text field, click the "..." button and locate the supplied .BBM file.

-3- Click the "..." button for the second field and choose where you would like the finished file to go.

-4- This is where the password goes. Type the password, which is usually the supplier's HN (and since Coyote is the only one, the password is "Coyote"). 
-5- Click the second button to mix the files.

-6- If you are missing a required part, it will be listed in this field.