Is there any way to create a new text box below the log-out?
– By log-out you mean your buddypress widget on the sidebar? You could add more widgets below it through the widgets page.
– Edit the specific page you want to have a 3 column layout. On the right side of the editor page look for Page Attributes. Choose 2 Sidebars template.
Looking at YOUR Homepage, you seem to have made multiple little boxes, like a magazine page.
– That’s the default behavior of WordPress upon first install. Go to
Settings -> Reading then for the option Front page displays, choose Your latest posts.