New Sidewinder and LiPo questions

[BL_RV0]

So, I went to the LHS yesterday and picked up a Sidewinder 5700 combo and a Impulse 2s 3200 20c LiPo. (Bought both of those because they were on sale ) So, I got the stuff all soldered up, installed, and programmed. And I am wondering how i program the Sidewinder via a Castle Link because i cannot seem to find the USB port on the ESC. Where is it? Is there something I am missing here? BTW, the new combo is running in my Rustler that used to be brushed. (Now I have 2 BL Rustlers ) Ok, so my LiPo question is that when I charged it on my Hyperion EOS1210i I set the settings to 2s LiPo, 3200mAh, 3.2A charge rate, and the pack only took in something like 1200mAh. Is this because the pack was already semi-charged or are my settings wrong? Thanks for your help in advance. The only setting I need changed is the cutoff voltage on the ESC because I'm using a LiPo, (obviously.)