Form - Tabbing Fields Out Of Order

I created a user form to get information to be added to a spreadsheet, and then later needed to add a few more fields. Now when you tab through the fields, they are out of order. For isntance it will tab down through the first three fields, then flips to the second column of fields, then back to the first again.

Is there a way to setup the order in which fields are tabbed? (Note: I am refering to the tab key on the keyboard being used to move between fields, not tabbing a form to create multiple pages.). How do I add a horizontal rule to the form? I dont see it in the toolbox...