There's two ways, Game chest software loads multiple games onto a single CF game card and allows you to pick from the games on screen.
The other and more typical way is to just buy individual game titles from members here or elsewhere, and load them individually on your machine.
There are Caveats! If you have a typical BB2 with OLED buttons, I don't recommend ANY BB1 cross compatible games (OS 9.XX) games with a OLED panel, unless you convert the BB2 to a standard or EBB mechanical button panel.
I recommend SCLR-000-1851 for fast(01:43) efficient clearing of BB2 machines, SCLR-000-1810 works fine too, just slower(~05:00).
Use the ram clear in the OS slot, it will clear the machine if all is well, and state to power down and insert OS at the end, the 1851 says this in plain text on the monitor, the 1810 with a GUI.
Pick your game to install next game in the game slot, OS in the OS slot. Initial loads time vary significantly by game and OS, but on the BB2 it formats the drive and installs the image of the game on there leading to a slower install than normal start.
You need to set: Machine info (if using TITO) Time, Devices, Accounting, Game paytables, coms, and sound levels. Launch the game. Immediately return to the setup menu, if you wish to modify bet all lines and max bet features.
OLED firmware problems are inevitable if you mix generations of games, I only recommend games running 3.09 OLED firmware for the OLED buttons.(Same as found on BB3s)