Craps dealer can be tipped in 2 different ways.
A Hand-In.
Toss your chip(s) towards the dealer and say, "For the dealers."
Bet for the dealers.
You can tip the dealer by making a bet for him. If the bet you have made for the dealer wins the dealer gets not only tips (the bet) but also the winning amount.
When to tip
In fact you can tip the dealer every time you want to do it. You can do it during the game when you are on a hot streak or right after the game. Most dealers probably prefer that you tip as-you-go, because you might bust out and not have any money left at the end of your session to tip with, but this is not to your advantage, of course. The smartest approach for a player is to bet for the dealers during once or twice early in the session, and do the rest of your tipping as a hand-in when your session's over. Early tipping allow you to get the best service and avoid tipping too much later.
Which bets to make for the dealers
Dealers appreciate any wager made on their behalf, but they greatly prefer bets that have a low house take, such as the Pass, Come, Don't Pass, and Don't Come.
Wrong bets only decrease the income of the dealers.

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