Customise existing theme

Im very new to wordpress, and a mac user since day 1. The whole css thing is very new to me. I have been trying to customise an existing theme but have fallen foul at the last hurdle. Can anyone tell me how, looking at this page
http://swfilms.net/?page_id=120
how I get shot of “posted by clattery 0 comments”, the word “pages”
and everything after the embedded video. Also I would like to insert my company logo into the header. Which is simply S L A T S & W I L L S F I L M S but in Futura Lt BT
the current theme Im using is Build 1.04 should I be looking for another theme?

Many Thanks

[duplicate: http://ww.wp.xz.cn/support/topic/changing-fonts-in-the-header?replies=1
please post only once per problem, and continue with your first thread.
i am closing this one.]