How do you reset service indicator message on a 2007 Mercedes clk350?

Actually you are neither stupid nor cheap! The gentleman who answered your question was wrong about how to reset the service indicator and also wrong by lending his own opinion on this matter. I salute you for doing your oil change and hopefully brake pads. Here is the correct answer to your question: 1. GET IN THE CAR AND CLOSE ALL DOORS 2. TURN THE KEY INTO POSITION 2 3. SCROLL THROUGH THE MENU USING THE KNOBS ON THE STEERING WHEEL TILL YOU REACH THE MESSAGE STATING WHAT SERVICE IS EXCEEDED AND BY HOW MANY DAYS 4. PRESS &&&&& HOLD THE "RESET" BUTTON UNTIL THE MENU SCREEN CHANGES AND ASKS YOU TO CONFIRM SERVICE RESET 5. TO CONFIRM, PRESS&&&&HOLD THE RESET BUTTON UNTIL THE MENU SCREEN CHANGES AND CONFIRMS THE RESET BY TELLING THAT NEXT SERVICE IS IN X AMOUNT OF MILES HOPE IT WORKS! Get to the BAsic screen. (Press the +- buttons until the buttons work.)

Press -> until it asks if you want to reset the oil life and to press the reset button.

The reset button is at the left side of the instrument panel.

Stop being cheap and stupid. An oil change by someone who knows what they're doing and won't break anything takes about 2.5 hours and will cost $500 or less. What did you pay for the car?