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Any experiences adding circuits to existing gateway breaker box?

Any experiences adding circuits to existing gateway breaker box?

I'd like to add a couple of 20 amp circuits, and thought it was just a matter of adding the breakers to the exterior box. After looking at the box, I noticed the notice on the outside saying "no new loads", so am thinking that this is more than the normal add a circuit task. Any experiences with this?
Thanks for any thoughts.