Hay there, Game KA!! welcome to Ben heck forums, good to have you here
1) Kasar has created his step by step guide for building a gcp also with new finds by various modders are added in to help future modders of cube portablzing.
he has a diagram for what points to wire up the regulator board to gc board:
viewtopic.php?f=41&t=26398and info and how.
i also have pics of my wring of this part in my work log in my sig if your interested in looking.
2) the multimeter is used for measuring the exact amounts that each point of the regulator gets from the power supply or battery when split for each required volt in the reg etc.and it tells you that you have the right volts indicating your soldered correctly etc.
3) easy, first take your pics off iphto by copy and paste on desktop and then have an account on a photo site like image sack/photobuket etc and upload it to your account on your photo site then when you make a topic of post her with a pic from you collection on you image site, just log in to your account and go to the image and copy the IMG link and when you post here paste the img link here and presto!
it'll look like this in edit mode: {IMG}
http://www.image site.com/acount user/imagename.jpegpng or etc/{IMG}
you can't directly post the images from iPhoto to here, you must first upload them to your image account site them paste the IMG link in your post here.