that's where mine came from, so if they are the same.....
turn the frame so that the top of the frame is sitting on the table in front of you. there should be a groove. on one side of the groove, the wood will be solid. on the other, the wood will be underscored and you can slip a flat head under there and pop it loose. put the foundation in and push the wedge piece tight against it. staple with a heavy duty stapler. 1/2 works well.
if you are using thin foundation in honey supers, you don't need to worry about support as much, but i put pins in the sides just to keep it stable until the bees build it out. if you are using thin in brood boxes, you may need to wire it. in my frames i use strips rather than full sheets, except that i give them 1 full full sheet per box if it is a swarm or package. that gives them a guide so that they don't build wonky comb.
different instructions for strips :-)