User Activity

Can anyone please explain the fees I will be charged when buying an item. On one page it showed the p/h & duty but when I actually paid the figure was $50 higher even allowing for the exchange rates.
How do I change my settings so they are always on World Wide? I have tried changing them but they keep going back to Default with every item I look for.
Can someone explain why the postal charges change on ebay depending on which page you are reading ? I am bidding on an item OS and when I first placed my bid the charges were reasonable . They show these same charges on my watch page as well as my bi...
 How do I block a seller I believe is scamming people?
What has happened to the 'Save to list " button? I like to save items so I can review them later but for some reason I can`t now. Can anyone tell me how I get it back please?Thanks