EBow control is really very simple once you understand some basic principles.
If the string isn't vibrating, make sure the EBow is resting squarely on the support strings and is not twisted out of alignment. If it's too loud, back it away from the pickup. If it's buzzing or rattling, tilt the EBow away from the string or relax the pressure against the strings. If you can't hear arpeggios, make sure you are playing directly over the HotSpot of a pickup that is ON.
If all else fails, read the manual and watch the video examples on the EBowTube page.