okay, i have an issue..

okay an example of what i need help on/my problem is,
whenever i try to save a animation from a site (right & save) it saves it has a bmp. and i want it to save as a gif. like the properties say it is. I know there is a way to change that. but idk how, and its puzzling me..

if this is way off and u don't understand i will comment back to you and explain again.

thank you for your help.