Hi Ron, great job. The new recruit gave you great advice.
If you'd like an overview of how to control LEDs with a resistor, adjust the current, and thus the correct brightness, you can see these posts from older threads.
However, remember: when choosing a (correct) parallel connection, as in your case, the currents are added for each LED you add (LED-resistor branch), so if you add additional LEDs, be careful about the total current in the circuit. The batteries (or a BEC or other type of power supply) must be able to supply it adequately. Logically, in your case, with a current draw of 18-20 mA per LED, and therefore a total of 40 mA, you shouldn't have any problems.
https://model-boats.com/forum/135645
https://model-boats.com/forum/138041