Cyn, Looks complicated, but really isnt. Measure the length and width of one of the fabrics then sew them together like in the 1st picture, but make sure where the edges of fabric meet next to the corresponding letters you leave the seam loose a 1/4 inch.
Connie in Co found the link! Good luck and let us see what end up with.
Sew the 4 pieces together like above with 1/4 inch seams.
[ATTACH=CONFIG]225833[/ATTACH]
This shows sewing the sides.
[ATTACH=CONFIG]225834[/ATTACH]
This shows why you need to stop 1/4 inch from edges. This is the seam allowance for the 'sides'.
[ATTACH=CONFIG]225835[/ATTACH]