In order to attach the gels to your flash you will want to stick the soft ("loop") sided velcro on your flash.  Tip: Lay down a layer of gaffer's tape on your flashes first, so that if you decide to sell your flash down the road, you can remove the velcro without leaving any sticky residue on the plastic.  (Gaffer's tape is not included in the Photogel kits sold by FlashZebra.com.)

Step 1: Measure and cut the velcro into 4 pieces for the sides of the flash.

Step 2: Attach the velcro to the 4 sides of the flash.

Step 3: Stick the velcro dots on the ends of all the gels.

Step 4: Attach the gel to the flash.  Make sure you leave a small gap of air between the gel and the flash.  This allows heat generated by the flash to safely escape and not heat up the gel.

Step 5: Use the top and bottom sides of velcro to attach other commonly used gels so you can swap between them quickly.

Tip: When using a Stoffen diffuser on your flash, put the gel on first and slide the Stoffen on top of it.

Tip: You can use a day planner booklet to store all your gels.  Line the pages with soft velcro strips and keep all your unused gels there.