It's on the drop down Menu list.
total kick to the gut
This is like having Ra's Al Ghul show up at your birthday party.
Also, you can use /change_handle <global name>.
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Biggest Troll on the forums? I'll give you a hint:
Menu > Chat Handle (X)
Keep in mind that you are only allowed to change your Global name once*. If you have changed it before, you probably wont be able to change it again, and clicking the above option will simply tell you what your current name is instead.
*Global server prolems in the past have allowed that option to be reset and allowing some people to be issued another name change, but it's not something we should ever count on.. so make sure you pick a name you are going to want "forever".
I remember seeing an option to change the Global name on your account somewhere but for some reason I can't seem to find it anymore? Can anyone help me out?