Click on the "Dice Room" link in the top right corner
Put in any nickname you want, and then use "B10" (without quotes), then click "Join"
Sometimes I may allow the PC to reroll something (like Bando's terrible HP that I rolled). If you choose to do so, you must take the reroll, even if it's worse than my roll. Attack rolls and such are not re-rollable...I'm mainly thinking of things like HP here.