You can use the wheel on your mouse or you can use the number keys, 1 2 3 4 5 6 7 8 9 0.
you have to press the sign up butten
Press Q. This will drop what you are holding. If you want to get rid of it permanently, drop it in lava.
Check on your control keys in the menu. Esc-Options-Controls. Look for the Pick Block if it says Button 3 its the middle button on your mouse like the wheeling thing. BE SURE TO HAVE MINECRAFT VERSION 1.8 OR THERE WOULD BE NO SUCH THING AS PICK UP BLOCK SETTING. AND PROTO JK. :)
You press F5.
press v
Press escape to open the menu. Press settings. Press controls. Click the control you want to change. Press the key you want to change it to.
Press f5
Press f5 to go to 3'd person, press it again to look at yourself, and press it again to go back to 1'st person. (as of minecraft 1.1 ^.^)
Press 'F' to change your fog render distance.
pocket additon: you cant Computer:choose a skin you like click on it then press upload to minecarft it will take you to minecraft home login if you have not allready press change then go on to minecraft and your skin has been changed!
You can press ESC. Then go to options, controls, and then change them there.
press I that's the default control unless you change the controls
press 'command' if i were you, i change the minecraft settings so you need to press the button 'c' to place blocks