A complex way to think of it is [here] which is interesting but to be honest it was not the way I thought of it! Thank you Purgatory for the link :D very informative.
mine was very simple, I simply listed the Alphabetics A-Z then chose the letter R to correspond a new listing for the alphabetics, reorganized them in the same pattern but took the R as a starting point, hence the R = A
So the word Hello in the red letters corresponds with the word Qnuux in the black letters. If you go back to the hints I put in that post, it will make sense now :>
This one was easy, be prepared for the next one :D