Help with Headers in iMac Pages

Hi yall.
Can anyone help me figure out how to do headers in Pages? I need to be able to write papers in MLA format which requires that my last name and current page number be in the upper right corner of each page.
I have yet to figure out exactly how to do this. I understand how to navigate to the headers and footers field and interacting with it. Ince I do that though, I'm lost. Perhaps it's because I've never worked with these in any word processer before. Anyway, any help would be appreciated. Thanks.
If this is complicated, I would love to Skype with someone who could explain it and maybe walk me through it. That would be super.