Click on your market, you will see a popup window that tells you what is needed in order to complete the upgrade, i.e. quantity of stone, ore, etc.. If anything is highlighted in red, that means you still need that specific item. If nothing is red, click on the 'Ask for help' upgrade (where 10 friends can deduct a minute each by clicking on your link when it posts to your FB page) or click 'Manual Upgrade'. Note, you can only upgrade to a level 10 max. If you are at a level 9, you will need a 'Divine Inspiration' which is available through the 'Shop' in order to get your market to a level 10.