If your embroidery piece is punch needle or if it is on aida cloth or another material that easily frays, apply stabilizer to the back of the applique and the surrounding material according to package directions.
Using sharp scissors trim the excess cloth around the applique leaving approximately 0.25" all around the design.
Using a needle and yarn or embroidery floss, whip stitch around the applique to hide the raw edge.
Place a piece of double-sided interfacing shiny side down on the back of your applique. Trace the design on interfacing and cut out.
Leaving the paper backing in place, apply the double-sided interfacing to the back of the applique according to package directions. Go around the design to ensure that the interfacing is fully adhered. Apply more heat where necessary until flush.
When ready to iron the applique onto another surface, remove the paper backing and secure in place using heat.