The following information is from the LC Homepage, pasted here for your convenience. The pics will be changed later to reflect the new format, but the principles still remain the same to access the Item Mall.
Accessing Item Mall
Inside the Item Mall
At the top of the Item Mall you will find 4 tabs. The New Item tab (Default when opening the item mall), All Items tab, Records tab, and the Help tab.
New Items Tab

After you click on the Item Mall Hotkey, you will see the New Items section of the item mall. This is the default tab showing when you first open the Item Mall. Here you can sort Items by what is the newest and what is the most popular. On the right side of the Item Mall you will see your Shopping Cart. This will show you what items you currently have selected for purchasing, and the total it will cost to purchase all selected items. Below your shopping card you will find your current Cash Balance. That is the amount of Aeria Points that have been converted to be used in Last Chaos.
All Items Tab

Clicking on this tab will display all of the items currently for sale in the Item Mall, sorted by type. Clicking on one of the buttons to the left (Consumables, Basic Items, Potions, Abata, Weapons, Armor, and Packages) will display all items currently available in that category. Clicking on an item will give you the price, as well as a description of the item. Just double click an item or drag it to your Shopping Cart to add to your current list of items to purchase.
Records Tab

Purchased Items is the default section shown when you first open the Records tab. This will show you all of the items you have purchased and provides a convenient way to transfer the items into your characters inventory.
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The Transactions section will display all of your purchases ever made in the item mall. You can sort by Year, Month and Date of the transactions.
Help Tab
This section reiterates all of the information found in these pages.