You'll need to provide more information about your iPad 2 - is the device 'jailbroken' and do you have only Wi-Fi or also a cellular 3G/4G SIM? For 'internet tethering' on an iPad, a cellular connection is needed to setup the iPad as a 'hotspot' - and I'm not sure if this capability applies to only the newer iPads or extends back to the iPad 2; I also have an iPad 2 which is Wi-Fi only - hopefully others will 'chime in' w/ advice. In the mean time, take a look
HERE (and scroll down to the post by PurpleSoul).
BTW, can your Android phone be setup as a 'hotspot'?