OK, when you click the world with a chain around it to create a hyperlink, it comes up with a box with http:// already in it. If your copying the web address directly make sure that you delete the http:// that is already in the box. Otherwise you will get double,
http://http://myblog.blogspot.com like Jana explained.
Or instead of deleting it, when copying the web address. Copy the part after the http:// - i.e myblog.blogspot.com or
www.craft.com
hope that helps and makes sense. lol
xxx