The phrase "to enter a passcode" means to type in a secret series of numbers or characters to gain access to something, like a device, account, or secure area. Full definition
The setup process for the Bluetooth hands - free link on Sync is similar to that on many other systems: set the car and the Bluetooth phone to search for each other, and then enter a passcode on the phone when the connection is made. (cnet.com)
In fact, the company created an update that addresses a list of problems that includes third - party keyboards being deselected when entering passcodes and certain apps being denied access to the Photo Library. (tomsguide.com)
So it means that you will need to enter the passcode at least once a week when you connect your locked iPhone or iPad with a USB accessory via Lightning connector. (iphonehacks.com)