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I don't understand how stacking works ... do you mean you can just put off the bonus until future months? what do you have to do to accomplish this... just sign up for it and then don't deposit money until you want to work on the bonus?

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Stacking means you can deposit 600 bucks for a 120 bonus. You can then decide to not play at stars. 2 months later they offer another bonus and you put in another 600 bucks and now you have 240 in bonus to clear. You can continue this way as long as you want. 3 years from now you can then decide to clear your 2000 dollars in bonus money. that is stackable

You have to deposit to get the bonus every time they come around.