1.) T on the left Side is for tempature
2.) H on the right side is for Humidity
3.) Docs Button to change to your my docs on windows 7 change username to yours. C:\Users\Username\Documents
4.) paint button is currently set to launch corel paintshop pro to change to yours open configuration window choose interactive buttons choose item #10 and at the bottom click the button next to external program setting and browse to your paint program.