You can also use an item registered in quickslots by pressing its corresponding number.
You can buy consumable items in general stores. Target and right-click a general store merchant and select 'General Store'.
If you want to buy an item in bulk, just hold down [Shift] and right-click on the item to buy the maximum number.
If
you left-click items that come in bulk, it will bring up an additional
popup screen asking how many of that item you want to buy.
Enter the number of the item you'd like to buy, then click 'YES' to buy them.
If you want to buy only one item, just right-click on the item.
You can buy a variety of equipments in weapons stores, armor stores, weapons blackmarkets and armor blackmarkets.
Mouse over the item to see its information and left-click on the item.
A box will pop up with the price for your confirmation. Click 'YES' to buy the item.
You can buy an item immediately by right-clicking on the item.
Press
[ I ] to bring up the inventory window to see spots for equipments.
Pick an item to equip and drag & drop in an available spot.
All NPCs who sell items will buy your unnecessary items.
Selling
is similar to buying. Open a store's inventory and mouse over the item
to see its information including the selling price.
If you
right-click on the item that you want to sell or drag & drop from
your inventory to the store's inventory, a confirmation message will
pop up. Click 'YES' to sell or 'NO' to cancel.
You can sell
an item immediately by holding down [Ctrl] and right-clicking at the
same time. Please be careful when you sell an item. Once you sell it,
it's gone forever.