Changing the post author

sorry if I am posting a bit much but I also wanted to know about changing the author on a post. Seems I don't have the ability with in this theme.
As with the edit post link on the posts which I just asked about in another post, is this turned off or just missing altogether?

Seemed like I could change the author of a post usually at the bottom of any post I would make. Possible this isn't a theme issue but something else?