It depends on the type. But some of them can be driven with WASD/arrow keys. While others need a drive tool. When you find one that works, it should work by pressing Y to start and then clicking where you want to go with the cursor. Press X to stop and G and T to do tricks.
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you cant
same way you walk
No, it is not possible to download Roblox to a flash drive. Roblox automatically installs itself on your computer, so you cannot choose where to put it. Finding the roblox files and coping them to your flash drive could work, but probably not.
Get a drive tool or use y to turn on and z to turn off
roblox :) hope it helps