You begin by soaking the wedding bouquet holder in water. You should always let Oasis foam "float soak", meaning that you don't push it beneath the surface, instead let it float and draw the water into it.
This holder will not sink like other bouquet holders, since the hard foam back keeps it afloat.
Always treat the water with a flower food before soaking the foam. This is a vital step that ensures your fresh flowers will be fed the proper nutrients, extending the bloom life of each flower.
The foam becomes saturated very quickly. Just be sure to give it a full minute in order to eliminate any dry air pockets that could mean death to a stem or two of your wedding flowers.