You can attach both to the bar.

this helps me, too because my panel is the same way, and i have GE powermark CRAP!

A main panel is the ONE place in most residential installations the neutral and grounding conductor are bonded together.

Every other place in the house should heave them separated.

The fed to a sub-panel will have two connections to the grounding/neutral bar in a main feeding it.

i do not get the seperation between n/g when they are bonded in the main panel, anyway. the code writers are idiots.

"i do not get the seperation between n/g when they are bonded in the main panel, anyway. the code writers are idiots."

I find is extremely humorous that you call the code writers "idiots" when you don't even understand basic electrical theory. Because you don't understand why neutrals and grounds are separate in sub panels, the code writers are idiots? You don't even own a copy of the NEC to even look at the codes, yet you're calling code writers idiots.
If anyone is the idiot here I bluntly say it's you, smithy. Your posts are a joke. You give blatantly wrong information and advice, and you act like you're some electrical God.

Stop posting before you get someone hurt.