1. Determine the control software and programming environment of the manipulator. Different robotic arms may use different control software and programming environments, such as ROBOTC and LabVIEW.

2. Write a program. Using the programming language of control software, a program is written to realize the 90-degree rotation of the mold. Upload program. Upload the written program to the control module of the mechanical arm so that the mechanical arm can execute the program.

3. Debug the program. In the process of executing the program, the mechanical arm debugs the program to ensure that the 90-degree rotation of the mold can be successfully completed. If there is an error or abnormality, you can find out the problem and solve it through debugging.