I posted my item on google base over a month ago. Now I cannot find it on
froogle. I edited the item, I edited the number of days left, but I still
cannot find it on froogle. What is the problem? Thanks.

As what I know products in froogle will be shown for 30days only and exceeding on that time will need you to upload again the products and wait for google base to activate your items,.

Are your products already indexed? or better yet upload it again,. froogle might already mark your product as expired item