Where do I put the leads?

[LeeWay]

Guys, I know this is really a simple question that I should know already. Exactly where do I put my leads when I am setting the vref? Does the black lead go on TPX for x and so on? Then where does my red lead go? Top or bottom solder joint on the blue (variable resistors)? I really have looked all over here and the Yahoo groups for a wiring diagram or a simpler proceedure to set up this board. I have no joy as of yet. With all I have read about messing up something, I want to not only get this right, but understand what I am doing in the process. This is now my top priority. The rest of the board is pretty straight forward from all the different sources that I have gathered the info. I can promise one thing. I will make a diagram and step by step proceedure in the future so that others may be spared having to ask such ignorant questions about this board.
Thanks in advance.

[buscht]

Red lead goes on TPX and the black lead goes to ground. (Its by the red light). Look close, it says G or something like that.

[LeeWay]

Thanks for the reply. I did look for a separate ground around the led, but no joy.
The way that I was able to set it on my fisrt board was by using the smaller VBB gound that is used for a fan. Is this a good spot? I noticed another ground on the 4 pin ENA thingy. Would this ground work as well? Are all the labelled grounds suitable for setting VREF's?
Thanks again.

[buscht]

You can use any ground as far as I know. I used the fan ground also, but be careful. I hit the power side with my lead and smoked my X axis.

[LeeWay]

Thanks.
I did see just how close I was to the positive once. It did arc som on me with my old board.
It didn't burn anything out though. All three still ran after that. I will be covering that positive side with a wire splicer sleeve when I set the new board. Lesson learned.

I wasn't sure if some of the grounds may have been tied to a resistor or something and might give a false reading. I will be cranking up the new board on a lower setting than the 3.5 volts I initially used. Maybe down to 3 or 2.8. I can work up from there later.