how do you replace lens cover on front light

If you are talking about the headlight. I dont think they sell the lense seperately, you have to buy the whole light. They do make kits to buff the lense and take away scratches and yellowing, if thats why your asking. If its broken or cracked then you will have to buy the whole thing.

The little chrome thing came off the tip of bulb,need to take lens apart to get to it

mine too looks like it is sealed at the factory