Brother PE 400D - Manual (Page 64)

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5. Once sewing is completed, return the feed dog to its original
position, pull the bobbin thread at the sewing end down and
pull the upper thread at the sewing end through to the reverse
side of the fabric. Then tie the thread ends together and cut
the threads at the sewing start.
6. When you are finished attaching buttons, make sure to return
the feed dogs to their original position. ( )
1 Feed dog adjustment lever
First sew the two holes which are closest to you. Once they have
been sewn, raise the presser foot, move the needle to the next
two holes and then sew them in the same way.
Attaching buttons with four holes