Turn off both breakers.
Fill the tub up with the hose in the filter well.
Once the tub is full, turn the jets on and run them for a few minutes. This ensrue there are no air locks.
After the jets have been running, turn on the heater breaker and set the display to your desired temp. Figure 5-6 degrees every hour.
If you find the tub is not warming up, it's possible that the heater was tripped. If this is the case, you'll need to open the front access panel and push the heater reset button.
Good luck!