Simply tap the 'Apps' icon in the upper left hand corner of the screen and locate and tap the 'Settings' icon.
Next, tap the very bottom menu option 'About Tablet' option and hit the 'System Update' tab.
In the pop up that appears on the check, take the option to force the check for the update. If you're device hasn't updated yet, it should pull down an update.
One quick note, if you happen to take the option to 'Download Later', good freakin' luck trying to get your update. If you haven't kept up with my previous experience getting the Honeycomb 3.1 download, be sure to go back and read those posts (7-11-2011-Acer Tech Support post) and see the the chat transcript between myself and a representative at Acer's Support Site.
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I have not received the 3.2 update. This did not do anything to initiate it.
MsMetaP,
This happened to me during the 3.1 update. When I spoke to Acer Support about it then they told me until the update rolls out for my device's serial number it will continue to say that the device is up to date even though it isn't. Sounds like you're bumping into that situation.