If you only have one browser, like internet explorer, that is your only browser and therefore your default browser. But if you have two browsers, lets say Mozilla firefox and internet explorer, open...
Go to page you would like to be your default homepage. Open Internet Explorer. Right click the one of the bars at the top of the screen. Make sure the Command Bar has a "checked" symbol beside it. If...
to change your default on myspace u go 2 photos and then go 2 a tab that says edit photos. click on the photo that u want as a default and when its enlarged click default picture on the top to use it...