When you have entered an input, wait until the "Done" message shows up. Then, your output is ready. Interesting hex outputs: input decimal (base 10) numbers 57005, 14600926, 2989 and get interesting outputs.
I did it myself. This is the basic code behind other languages' inter-mechanics of converting bases. Note: the larger your input value, the longer it would take to calculate. You can enable turbo mode for higher speed.