For the new about Touch ID, who are new for use touch ID available in iPhone 5S/ iPhone 6, 6 Plus. Here is the full guide on how to setup or remove/ Add fingerprints in Touch ID and Also for add more then five touch ID in single device for Open lock or install App in the devices (iPhone, iPad and iPod Touch). So you can add different finger for faster access your iOS device as an AlterNet finger. In any case you failed for add more touch ID finger, then check and verify that you have updated with latest iOS or not. Add five fingers are easy with straight forward process but add more then five fingers, you have to understand below steps very well.
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Steps for Add fingerprints in Touch ID: iPhone, iPad or iPod Touch with iOS 8/ iOS 7
Step 1: Go to the setting app in your iOS device.
Step 3: Now, You can see blank white screen by put finger on home button and lift up finger when your iPhone vibrate. Repeat this, till your finger fully Scan and All the line fill with color. Once your complete full scan your next screen should be like in next step.
Step 4: Tap on Continue, now you have to scan rest of the finger with outside edge.