Easy find this on bonus policy section.
Wagering whilst having active bonus offer(s)
Whilst having an active bonus the maximum bet allowed is €/£/$5 per spin, €/£/$0.50 per bet line or for card and table games the total maximum stake is €/£/$5 until wagering requirements have been met. This includes double up wagers, gamble features or buying features. Lucky Spins reserves the right of voiding bets and winnings resulting from bets of larger amounts as well as applying a wagering penalty on current bonus(es). Unless otherwise stated, bonus(es) will be wagered in the order they are given to you and can only be wagered one by one.