Ubuntu Issue after install

I just installed Ubuntu 9.04 to a usb stick. The install went fine, and works no problem. However when i add my wireless and change the desktop picture, then reboot, it reverts back no wireless and original picture. Is it something I'm doing wrong? AM sorta new to Linux and Ubuntu. Could someone please help me

Install

A USB stick install can be just like a LiveCD disk - so you cannot save to it. You need to make a "persistent" install - that saves alterations.

how do i make a "persistant"

how do i make a "persistant" install that will save the alterations