If you click this hyperlink it will show you what items require attention. On each item's catalog page there is an 'Edit' tab. Click this and then find the Dimensions button. Once you've entered these (and possibly shipping dimensions if necessary - instructions are there as well), scroll down and hit 'Submit'. Admin will approve these, but it can take up to a few days.
Personally if I discover items like this, I untick the 'for sale' box for each item until the dimensions have been approved.
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Personally if I discover items like this, I untick the 'for sale' box for each item until the dimensions have been approved.