Hello,
I no longer had hot water; I drained and changed the bottom element... Feeling confident I walked over to the sink and nothing, not a drip when the hot water was turned on. The cold water works.
It has been four hours, and still no hot water or hot water pressure; please help thank you

Did you open the cold water input valve to the water heater. Open water heater drain valve momentarily to see if you have water in the heater.