2006 ford explorer wont start and lights wont work on outside or inside. I hear a clicking sound on the inside under dash. The battery is fine checked it what else could it be?

Since your battery is fine and you hear a clicking sound there is a problem getting the power to the rest of the systems on the vehicle. That clicking noise is your starter that doesn't have enough juice to get it going. This may be something as simple as dirty or rusty terminals, a bad connection between the terminals and the cable or even bad battery cables. The ifrst thing you should do is take off your battery terminals and clean them clean them and also while you're at it take a look at those cables to make sure they aren't obviously damaged. Reconnect the terminals to the cables and battey and see what happens. If it doesn't work, you'll need to have a professional look at it.