Above is step 1, completing the crossword.
After that, you will start at the top left, and from left to right, top to bottom (you know, how you normally read), you will do the following: When you come to a letter, find the next instance of that letter, and cross both those letters out. For example, if the first box is an A, you will find the next A and cross both out. You will NOT find and cross out all A's.
Repeat this continually, and you should be left with 11 letters that are not crossed out. Enter them, in order, and in all CAPS here: Enter Code
This will grant you the coordinates you seek!