Use this link and you should be able to 180+10.
http://disneyworld.disney.go.com/en_GB/
After the website opens, click on WHERE TO EAT then Make Dining Reservations (This opens the old dining reservation section, you will need your Resort Ressie number and arrival date to link to your dining plan).
Don't click anywhere else or you will be sent back to the new website.
Hope this helps.