Separate names with a comma.
I don't think there's a way to add a number row to the SwiftKey keyboard at this time, but in my opinion at least, it's more worth it to use...
I ordered from the store last month, they sent me an email about the order. Try searching your email.
I'm upgrading from the LG Spectrum 2. A family member was kind enough to order the S4 for their upgrade then trade with me.