From your iPhone device:
In your iPhone device go to App Store, press Search and search for Sticky Password.
Select the Sticky Password for iPhone item in the search result and press the FREE button on the top right position and click Install.
Enter your Apple ID and password credentials to initiate installation process.
Sticky Password for iPhone is now installed on your iPhone.
From your PC/Mac:
Go to App Store, your iTunes will be launched (if not, press View in iTunes link under Sticky Password logo on the left side).
Press on Free App (Download) button under Sticky Password logo and enter your Apple ID and password credentials to download Sticky Password for iPhone.
Synchronize your iPhone device with iTunes and you’re done.