New to Elgg

Hello, new to Elgg, looking for some beginner info, but I'm kindof at a loss trying to navigate through this.  I guess my main question is: can I customize/integrate this software to look like the rest of my site?  

I've seen several posts regarding newbie tutorials, but they all lead to the same information on the download page.

Thanks for any info, I can't wait to get this up and running!  It seems very fun.