The easiest way to make this entry if to switch to the Forms view (Ctrl+2) and the use Open Form and search for "form 8606" then double-click on the Form 8606 you are working on. You can then go directly to line 6 and double-click in the blue entry field then click the + on line 8 - Part IV, and fill in the screen that populates. (see screenshots below)
Please comment if you need additional help with this entry.