First things 1st: SB money isn't real, it's just Sherdog fun. You get some money to start out with, but if you lose absolutely everything - you will get a friendly refill after a while. At least I did. With that...
Go to the main page.
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https://forums.sherdog.com/sportsbook/ (all sports)
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https://forums.sherdog.com/sportsbook/category/mma.1/ (MMA events only)
Pick an event event. Say, the main card of UFC on ESPN 16.
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https://forums.sherdog.com/sportsbook/ufc-on-espn-16-10-3-10-30pm-et-main-card.14690/
- Pick, say, Germaine and on the right side of her name press on "Place Wager". A new, smaller window will pop up that will give you the odds, tell you how much sportbook dough you have and allow you to place your bet.
- Type in any number you can afford and feel comfortable with, say, 3.50 and press on "Place Wager". A grey bar shows up informing you that you have placed your bet.