Welcome to the forum
Most likely the bypass valve is in the winterize position. You need to access the back side of the water heater, probably by removing a panel. You may have a single valve or 3 valves.
Water will flow in the direction of the handle, so it shouldn’t be too difficult to figure out. If you turned the water heater on electric, you may have burnt out the element. It I have seen one survive a “dry tank”.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.