Set your machine to the #1 buttonhole stitch setting.
Pull the buttonhole foot slider forward so it's larger than the pencil mark. Place your fabric underneath the foot with the needle directly above the far left hand side of the buttonhole mark and lower the foot. You can turn the wheel manually to place needle directly at the top left corner of your mark.
Sew to the end of your mark. You will have a zigzag down the left hand side of the buttonhole mark.
With your needle at the highest position switch your machine to the 4/2 buttonhole stitch setting.
Take 5 stitches in this setting. This will tack the bottom of your buttonhole.
With your needle at the highest position change the stitch setting to the #3 buttonhole stitch.
And sew until the top of the buttonhole mark. This will be the right hand side of the buttonhole.
Set your machine back to the 4/2 stitch setting with your needle at highest position.
Take 5 stitches to tack the top of the buttonhole.
Raise your foot and take your fabric out of the machine. Leave 4" tails of both the bobbin thread and the needle thread.