newbie questions please

I have several questions that I can use some help with please:
I am using responsive dp with the new wave child theme. Going through setup.
1. I am using some sub categories but they are not showing. How do I get them to show?
2. Is there a link to help that goes step by step in words? I am having trouble with the videos although Mark has done a great job with them.
3. How do I make the submit listing button appear?
4. How do I change my logo and what size should it be?

Thank you so much guys:-)