To use a computer control system for a building hoist, first ensure the system is properly installed and integrated with the hoist's mechanical and electrical components. Begin by powering on the control system and checking for any error messages that might indicate a problem. Once the system is ready, input the desired parameters such as load weight, lifting height, and speed settings. Use the control panel to initiate the hoist's movement, monitoring the progress on the system's display. Adjust the hoist's operation in real-time as needed, ensuring safety protocols are followed. Regularly check system diagnostics for maintenance alerts and address any issues promptly to maintain optimal performance.