Without the action applied, pressing the tab key will move you through the form elements in the browser window in the order that they are output in the HTML code. This action, applied to form items, lets you control the sequence in which the tab key will move through the items.

Select the form item in turn then apply the Tab Order action from the Item > Action menu

Tab Order - The position of the form item in the sequence. When pressing the Tab key in the browser, the cursor will move through the sequence in the order specified.

Make First - Make this item the first in the sequence

Start Here - Start the tab sequence at this item

Make Next - Make it the next item in the sequence