how to turn off the battery signal off after changing the battery?

Have the CHARGING SYSTEM (alternator) tested! .. IF the alternator output voltage is low, the light will remain on and the battery will eventually become discharged .. That is likely what happened to the battery that was removed... Be aware that IF the battery voltage gets low enough, it can cause the engine to stall while driving!

Hi there: Would be a good idea to take and have your system checked quickly. I would recommend taking it to an ASE Certified Repair Station. I think it would be a simple adjustment. We here at Ultimate Performance would be more than happy to look at it at no cost to you. Please feel free to stop by at your convenience. Ask for Vanessa. 951 360-8518 Look forward to being of service. Sincerely Ultimate Performance Team