"4. Find the applications you want to install ON THIS DEVICE"
Based on your title I was hoping to see how to install apps on multiple devices. So, your instructions are useless really.
If you own more than one android device, usually one phone and one tablet, and you have installed different application on each device; you still can have the applications on both devices if associated with one Google ID.
To install applications on your entire android devices associated with your Google account, follow the instructions: