c# game - change how it works

I found word search generator that will generate a puzzle after words are added. What I want to do is read words from a list via text file have it choose 15 words at random and generate a puzzle. once they complete the puzzle have it ask if they want to play again if yes generate a new puzzle if no then ask if they want to exit The other issue would be finding the words. if they find a word need to some how allow the user to draw a line through it or click on each letter of the word changing the bg color or something. The generated words need to be listed in the list box as well I have changed it some to get to this point. I have included the project plus the word list I would like the word list to be read from settings if possible