Simplest way is to click "Manage my pledge" on main project page, on right side. Then change your ledge, select different one (for the same reward) and you will be able to select shipping costs from scroll-down list of countries and regions.
You can also cancel your pledge and pledge again - this time you will be presented with scroll down list of available shipping options. Select one appropriiate for your pledge and location.
Just select appropriate shipping cost for number of games you want:
WHOLE Europe = EU Shipping rate
ASIA ex. India = China shipping rate
US, Canada, rest of the World
How much shipping costs can be found in main project description, under SHIPPING.
All above is true for single reward pledge. If you want to pledge for 3/4/5... games see previous FAQ.