Each of these services allows you to create a blog on its servers. Follow the instructions at Tar Heel Bloggers to create a blog on your UNC Onyen server space – when you do this, your blog’s address will be www.unc.edu/~youronyen/blog.html.
Subscription blog services such as TypePad offer more publishing tools and page design options. Server-side weblog software such as MovableType and TextPattern - which you install onto your webspace - is more powerful yet, but such programs require HTML savvy and other programming knowledge. See Blogroots for a comprehensive list of weblog tools and programs.