New dishwasher will not drain?

I just had a new Maytag dishwasher installed by the Loewes contractor this week. The dishwasher will not drain. I think the problem may be that the plastic pin in the garbage disposal has not been removed. I have no experience with plumbing, and I just went through a house flood. Is this a repair I could attempt on... show more I just had a new Maytag dishwasher installed by the Loewes contractor this week. The dishwasher will not drain. I think the problem may be that the plastic pin in the garbage disposal has not been removed. I have no experience with plumbing, and I just went through a house flood. Is this a repair I could attempt on my tonight, or should I call a handyman in on Monday to attempt to fix it? I would like to get the Lowes installer back here but that might be a chore and a half.
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