If the frame doesn't have a tab opening on the top, you could use a piece of ribbon,(about 3", fold in half and knot together), leaving a short piece of the ends. Then glue it to the frame with the knot at the edge of the frame. Do this before putting on the backing.
If the frame has a "tab" on the top with a hole in it, slip a piece of ribbon through the hole and tie a knot.
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