Apple
Select iPhoto,
highlight the photo by clicking on it,
click on File and select Export from the drop down menu
A small new window appears. On the left is a SIZE selection. You can select 'Full size' or 'Scale Images no larger than' and there is a box showing the current size and you change the numbers. Something in the 600.700 is good.
Click the export button
Select destination Desktop and send.
Pop it into Photobucket or whatever remote source you use and there we are.
It sounds a lot more complex than it is.
Apple users are spoilt as we can drag Images to most places.
This one of Mr Thailand Competition finalists 2005 is 700 wide. Mr Tham on the left is the brother of Mr Kit on the right!