In order to access your computer from your iOS device using Remoter, you need to make sure you have a VNC server running on it.
[box]OS X
If you have a Mac, click here (Regular Instructions)
Easy Setup with RemoterFusion for Mac 10.6+ here *Requires Remoter VNC 3.0*[/box]
[box]Windows
If you have a Windows machine, click here[/box]
[box]Linux
If you have a Linux box, click here[/box]