These are the products I used... frame from the dollar spot, DP from Scatterjoy, self healing cutting mat and exacto knife, fiscars paper trimmer and Xyron. Simple!
First thing to do is measure your frame.
Next cut your DP to the size of your frame plus add 1/4 inch to every side.
Then you run the paper that you have cut to size through the Xyron.
Remove protective backing from you DP and lay the DP face down on your self healing cutting mat. Next center your frame over the DP after it is centered press down to adhere. (Be careful here, you do not get a second chance with this adhesive.)