Go into BattleScribe, and click either "Save as HTML" or "Save Roster":

BattleScribe Save and Save as HTML buttons

Then put the HTML/ROS/ROSZ file here and wait for a little bit (a few seconds, tops, unless you're a dick and tried a 12,000 point Apoc list, in which case what the fuck):


You should get a prompt to download a PDF that looks something like this:

Output data roster example

Followed by a bunch of these:

Output data card example