Time Duration

I’m am trying to do a background slide show but I can’t get the images to change, how do I set Time duration?

Can you be a little more specific?
Maybe you didn’t pressed the Animate Editing Mode button?

Ok, I am making an animation where I have my character moving through a series of back grounds. I’m trying to use timed swap but I’m having difficulty making the images switch. Could you please help me find a way to switch them?

Possibly showing us an example would help on understand where are your troubles.