can i attach 2 resistors together? For example, I need a 200 ohm resistor can i attach two 100 ohm resistors and if yes how do I do it?
Yes. You can put two resistors in series. So in your case, you solder one leg of one to the leg of the other. Here is a picture: http://www.cooperbills.com/Projects/MXRevolution/pics/2resistors.jpg (http://www.cooperbills.com/Projects/MXRevolution/pics/2resistors.jpg)
Sometimes it's easiest to make a "teepee" to put them in the board.
nice thanks