Last post font weight

[Dixie McCall]

My forum titles are in bold but this makes all my links in bold. Where would I change the following to normal weight (Not bold)

Last post text in forum index (like xf)
Member name in last post index (like xf)
Main Navigation font

I assume this is all done through added css? . Can't figure it out in properties

Edit... Shoot I put this in wrong forum. So sorry about that. >tired