There exist at least two ways of tipping a Craps dealer.
A Hand-In.
Throw the chips on the Craps table. But don’t forget to say “For The dealers”.
Bet for the dealers.
You can simply make a bet for the dealer. 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
You can tip during your session (especially if you're on a hot streak), or at the end of your session. It is only natural that dealers like it more when you tip them during the game when you are lucky and win because then it can happen that you lose everything and has nothing to tip the dealer with. As a player you’d better bet for the dealer once or twice during the game and then hand I when your game is over. The dealers will notice your early bets for them and make sure you get good service, and by delaying future tipping to the end of the session, you can avoid a situation where you tipped heavily during a hot streak and then hit a bad streak, with the dealers winding up with more money than you.
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.
Dealers cringe when players make bad bets for them, because such bets waste a good chunk of the tip.

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