Plug the lead wire into the A port. Snap two pads to the end of that single lead, remove the plastic film from the sticky parts and attach both sticky sides of the pads directly to bare skin. Then with the display showing, click the (+) button all the way to the right at bottom at least four or five times (or more if needed) to start feeling intensity and can visually see the black lines of intensity showing from the flashing (A) at the bottom of the screen.
The (A/B) button, if selected, will switch to the B side. And if no lead wire and both pads from that wire are not stuck to bare skin, you will not feel anything. You always want to match the wire in the A port with the A intensity on screen or the wire in the B port with the B intensity on screen. And continue to click the (+) button on the right until that intensity starts to fill up the intensity bar.
eMP10 User Manual download below: