How do I transfer app from computer to IPad?

connect your ipad to your computer using the usb cable

you then start up itunes on the computer

then you click on the ipad in devices in the left side panel

then you click on the application tab on the ipad content panel where you can chooes which apps you want on the ipad

then you press the button called sync

Is it an app downloaded from iTunes?

 Cheers, Tom 😉

I do not see an application to select the apps I want to be downloaded (in the left side panel).