The memory they are asking about isn't the media card, it is your file free memory in bytes, found in Options>Status, 3rd row down, copy and paste it here in a post.
That will tell us what you are working with and what needs to be done to get you on the right track. Thanks!
Posted from my CrackBerry at wapforums.crackberry.com
Everyone with an 8830 should use a media card and move all media to it. If you still have memory issues you may need to run apploader and remove some unused apps to free up memory.
yea if that does not work you might try wiping the blackberry sometimes the best thing to to start fresh but look at that link joeymusleh put up, it covers alot about freeing up memory