How to change a text message setting on my iPhone?

I have an iPhone 4S and my "friend" got into it and every time I text the word OK, it comes up "Allison is the greatest".It was cute until I found out that she was having an affair with my husband! How do I change this!

Go into settings>general>keyboard>shortcuts, then there should be a short cut for the word okay and allison is the greatest, just delete it, swipe it to the right to delete it

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