First lift the covers off where the bolts should be (they should lift towards the tank). Are the bolts in place? If not, go to your neighborhood hardware store and look for replacement hardware. (Most stores will have staff willing to help you find the right parts.) Is the bowl damaged so that the holes seem large compared to the holes in the seat anchor points? Are the seat anchor points damaged?

The bolts should have nuts (and possibly washers, but not all models use them) underneath the bowl. Screw down the bolt while holding the nut from turning (so you need an adjustable wrench or appropriately sized wrench). Again see the local hardware store for the hardware if you do not have the nuts. Keep the seat centered as you tighten the bolts. (Alternate tightening until it is stable - do not tighten one bolt all the way down before doing the other side. You risk overtightening and cracking the bowl.)

I hope this helps.

Cindy Wells
(if the seat is damaged, you may want to replace it. If the bowl is damaged you must replace that.)