Cannot connect when 2 macs on trying to use internet

Hi,
I just bought the i3 iMac...we were given an iMac that is 3 years old just after that. The problem is when my wife is on the older mac and I'm on the i3, I can't access the internet -- it's set up wireless with airport extreme. She has no problems. But if I'm online 1st, there's no problem for either of us.
Next, I had transferred all my data from my Macbook Pro to the i3...but now I cannot access our wireless with that laptop. As you may be able to tell...I am technically challenged!
Thanks for any and all help!

Hi, nimiokoka. Try this:
Open AirPort Utility, which can be found in the Utilities folder of your Applications folder. Click on your Extreme in the sidebar, and then press "Manual Setup." If you're asked for a password, enter it.
Press "Internet" in the toolbar. Look at the "Connection Sharing" field. If my suspicions are correct, it will be set to "Off (Bridge Mode)." If the Extreme is your main router, you'll want to set it to "Share a Public IP Address." Then press "Update" and allow your Extreme to restart.
Does this work?

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    Fist, uninstall Fingerpop beta > http://www.finderpop.com/manual/210/title.html
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