I have been trying to create a new horizontal menu tab that when clicked links to another website. In the support section it does say you can do this:
"Adding Custom Links
Want a menu item to directly link out to another website? No problem! Type in the URL, the label name and then Add to Menu."
However I have been trying everything and I cannot make it happen. In fact, I cannot even get a tab to show up at the top unless I make a page for it. the problem is that a page only allows one post. I need to have multiple posts. My solution was to create a new WP blog and try to link it to my home site.