How to change front lens

I am not totally sure on this model, but ones that I have repaired in the past you might have to order the whole front lens assembly which would require you to disassemble the camera and replace the assembly or you might be able to replace just the front lens which will have an adjustment either cammed or just screw it

into place. To find that out see if the ring around the front lens is removable by either unscrewing or it may just pop out, then you can see if the front lens can be replaced easily.

You will have to call Nikon to fine out if parts are still available for this model.

Hope this info helps you out.