1. First click Insert in the open cad drawing, and then click Image Reference.

2. Locate the signed picture you want to insert, and then click Open.

3. Then select the first point in the graph to be inserted, and click the left key to confirm.

4. Then enter the specified scale factor or pull the box to confirm.

5. Left-click to select the inserted drawing, and then click "Place behind Object" in the modification tool.

6. Then enter 0 in the dynamic input or command bar, and then remove the border of the picture.

7. When finished, check your signature in the print preview, as shown in the figure below.