In AutoCAD, to select the midpoint of an object, you can use the "MIDPOINT" command. The following are the specific steps:
Enter the command: Enter "MIDPOINT" or the abbreviated command "MI" in the command line of AutoCAD.
Select object: Follow the command prompts and select the object (such as line, circle, etc.) to find the midpoint in the drawing area. You can select objects by clicking on them or using a selection command such as "PICK".
View results: AutoCAD will automatically identify and calculate the midpoint coordinates of the selected object and display it in the command line. At the same time, the midpoint is also displayed graphically in the drawing area for reference.
Please note that commands in AutoCAD can vary depending on the software version and configuration. If the above commands don't work correctly, consult AutoCAD's help documentation or search for tutorials to get the exact commands and instructions for the specific version you're using.