STEPS
TOOLS
Locate setting in your homepage
Then click on (General)
Accessibility
Scroll down to Guided Access
Turn on and set a 4 digit password
Set a password you can remember
Go to the app you want open open and triple click the home button to set it up do the same it will ask you for that password to deactivate..
This is ideal for mobile payment app like square, intuit payment when you don't want your employee or kids to access other apps.  For more tips like this go to Mevup.com like and follow  & share
 iPhone 
 iPod 
 iPad 
 iOS 7

How to lock an app on ios 7

Do you remember that time you kid was playing with you iPhone or iPad and he when somewhen on you device He was supposed to be we'll let me show you how to stop that