To install a one command maybe be easy, but installing a two command is just a little bit more tricky. First, get yourself a command block by typing /give @p command_block in chat and press enter. If you are doing this on a server, you must be OP'd to get the command block and be in creative mode. If you are in singleplayer just make sure you are in creative mode and have cheats enabled. Place down the command block in an open area so nothing important gets destroyed. Paste the first command into the command block and power it with redstone. Now copy the second command and place a command block in the same spot the original one was. Paste the command into the second command block and power it again with redstone. Now all you have to do is rightclick the bottom sign that says [On] on it. Now you are ready to play!

cocoa beans + sugar + milk = Chocolate
torch + redstone + sugar = Spicy Candy
spider eye + sugar = Sour Candy
slime ball + 5 sugar = Hyperboost Candy
bone + gold nugget + sugar = Hurtful Candy
red clay + lime glass + redstone = Lucky Block