symbol -> movie clip symbol?

how do i make a symbol a movie clip symbol also?

What extactly are you try to do?

You can change the behavior of the symbol by selecting it in the library. Right click-> Behaviour

i am sorry i jumped in a bit too quick, i was following a tutorial and noticed that it kept saying "make sure you make the symbol amovie clip symbol also" so i was like it must be something different but now i realise its prolly just the options:
-movie clip
-graphic
-button

button is self explanitary but what is the difference between graphic and movie clip?

A Movie Clip supports action script, and can communicate between timelines.

thank you again :)