Embroider each panel on a separate piece of matching fabric.
Cut the excess fabric so that only 1/2" remains on each side.
Then using your sewing machine, sew the panels together leaving about 1/4" of the fabric showing between each panel.
One way to do it is to lay the panels out on the table.
Take panel 1 and place it face down on top of panel 2, so that the panels are directly above each other.
With the back of panel 1 facing up mark a line along the left side 1/8" away from the embroidery and pin the 2 pieces of fabric together.
Sew the two pieces of fabric together along the line you have just drawn.
Lay the 2 panels facing up back on the table in their place with the other panels.
Place panel 3 face down on top of the panel 2 and line up both panels so they are directly on top of each other.
With the back of the panel 3 facing up, mark a line along the right side 1/8" away from the embroidery and sew along the line to create a seam.
You should have all 3 top panels sewn together with a 1/4" of fabric showing between them.
Place them back on the table in place.
Work with the middle row of panels. Do not attach the panels from the middle row to the top row yet.
Sew the middle row of panels together just as you have done for the top row.
Then sew the bottom row of panels together as you have done the top and middle rows.
Now lay each row down on the table again and place the middle row face down on the top row. Make sure the middle is upside down as well.
Make sure both rows are directly on top of each other and that the sides and tops of the panels match up.
Sew the seam so it connects the bottom of the top panel with the top of the middle panel. With a fabric marker draw a 1/8" line away from the embroidery. You should be looking at the middle panel that is upside down and face down with the line at the bottom closest to you (which in the fabric it would literally be the top of the middle row).
Do the same thing with the bottom panel to connect it with the middle panel. Now you should have all 9 panels sewn together.