I just got my S4 at the Verizon store here, and the rep used a gmail account I use to get some things activated. I have one main gmail account with a few others that are more or less reserves. I couldn't remember the password on my main one, so I used one of my secondary ones. But now that I'm home I either want to replace the gmail email that I have on the phone with my main gmail email, or add it like I could do with my iPhone (I had multiple email accounts on it). Surely there's a way to do this?