So, on to French Seams. Don't be scared by the number of steps - they're quite simple and after you do them once you'll remember how to do them forever :)
What you need:
- fabric (whatever your project is)
- an iron!
Step 1: Put the WRONG sides of the fabric together where you want the seam, and stitch. This will seem counter-intuitive, but I promise it will work out in the end :)
Step 2: Trim the seam down as far as you can (further than my picture shows, if possible), and then press the seam open.
Step 4: Stitched down the length of the seam, with the fold you just pressed at the edge of the foot ( once again, the fabric should be wrong side out).
Step 6: Now, your final seam: stitch the edge of the flap down. Make sure your seams are straight and even, otherwise it will look funny!
And here's what the right side of the fabric should look like: