If you have an active warranty on the DS, check to see if it covers that kind of damage, if it does then take it back to the retailer you bought it from and see what they'll do.
Even if you don't have a warranty, you can try taking it to wherever you bought it and see if they can fix it or tell you of a service that does so.
Yes. On the DS on the home page, you press x then y then you press the left shoulder button then the right shoulder button.
You can blow into the shoulder button that is not working for a temporary fix. But if you want it to stay fixed you should use an air compressor & blow air into the shoulder button that is not working.
left, right button on DS you mean? The buttons on the rear corners?
click the left and right button
For the DS game, A button - forward B button - backward Arrows - left and right R button - change camera angle
The analyze button is on the left of your screen in the middle it is a ? mark. Click on the ? mark and a loading thing will come up and then you can analyze it.
The Nintendo DS does not specifically have a 'c' button.
hold the L button while alternating left and right
pull both the l and r up then push it back down
you didn't take care of it enough and/or the warranty expired and they don't make it durable enough to last longer than about a year (my gba's and DS's all have bad shoulder buttons)
On the inside face of the bottom half of the DS there is one button on the upper left side above the directional control button. This is the power button. After you press the power button the two game screens should power up. There should be a message at the bottom of the lower of the two screens to touch the screen to continue. The screen with the message on it is touch sensitive. If you touch the screen the DS will boot up the menu screen.
When driving, press the R button and hold the direction you are going(if you are drifting right, hold right button; if left, use left button). Then alternate the button side to side, being sure to stay in control of your kart. When you see golden sparks come from your kart, let go of the R button and you get a boost.