BuddyPress.org

I did the latest update to BuddyPress and am having some problems. I accidentally changed the link to the default posts that my site uses as it’s home page and now my site opens to Not Found. If I go to the post itself, there is no option to set it as default. I have no Site Admin section in my Admin panel. What do I do? How can I fix this? Where did my Site Admin panel go? Please help!

Also, when I mark users as spam, nothing happens. the page refreshes, says they were marked, and they are still unmarked.