How do you like sing into a mic thats plugged up 2 tha computer and upload it on myspace or whatever? idk how?

how do i do it!!??!!?? help me!!!!!!!!!!!! i cnt figure it out and i need some help!! please help me!!!! thanks ya!!!!!!
How do you like sing into a mic thats plugged up 2 tha computer and upload it on myspace or whatever? idk how?
Just use sound recorder