I searched the web and there is no such model number. There are lots of Papago GoSafe models. Type the exact name, model, followed by "operating manual" into a web browser and download the operating manual. Search the PDF for "speeding alert" and you should be all set. Or give us the correct model number and we'll find it.
us.papagoinc.com
I downloaded one manual and found the following instructions:
1. Down arrow to get into menu
2. Driving Safety
3. Speed Limit Sign - Can Enable, Disable, or mute.
Whenever I purchase or receive a device that has an instruction manual, I download it, file it and read it so that I can understand the device' capabilities and change it to suit my needs. It also typically makes searching for features easier.