Download the latest forum script from the mybb site - upload it to a sub-folder of your adoptable website (forum works), then go visit the index.php page of yoursite.com/subfolder/ and it should direct you through the process of installation.
It's quite similar the install process of mys - there should also be a readme file for you to go through, so check for that. My knowledge may be off since its been a while since I've installed it, but most installs go like that.
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