If you want to create two Titan accounts, you'll have to use a new email address. Each email address may be associated with only one Titan account, and unfortunately it would be non-trivial to change that. (If you don't want to worry about checking two accounts, you can pick up a free email account from someplace like Gmail and tell it to forward everything to your normal email account.)
But are you sure you need a second Titan account? If you're looking at using City Info Terminal, it is capable of handling multiple game accounts under a single Titan account. It tracks the global name alongside the character, and it also tracks server name which would make it easy to spot EU vs NA characters.
