Q: How to get my iPad Bluetooth to pair with my HP Officejet mobile 100 printer

iOS: How to troubleshoot Bluetooth connections

http://support.apple.com/kb/TS4562

 Cheers, Tom

You don't with BT.  The only way to connect an iPad to a printer is with AirPrint, using wifi.  See this for more info... http://support.apple.com/kb/HT4356

These are the iOS supported Bluetooth profiles: http://support.apple.com/kb/HT3647

There is no support for Bluetooth connections to PCs or iPhones except for Internet Tethering (Personal Hotspot via PAN on iPhone) or for using third-party apps that provide peer-to-peer Bluetooth connectivity between iOS devices running the same app (such as photo sharing apps, e.g., Photo Transfer, multi-player games, etc).

Apple does not supply BlueTooth printer drivers for the iPad nor will iOS allow you add print drivers.

Apple provides one driver for iPad printering and that is AirPrint.  That leaves you buying a airprint compatible printer or additional software -- iPad applications for printer or more software/hardware elsewhere.

See here for more Airprint basics and lists of Airprint printers. http://support.apple.com/kb/HT4356