Back to the demo. Please bring the Traiit Data and Editing window to the front and look for the Interval Mapping button. Please confirm that you are back to the trait amyloid beta precursor protein.  If so, then just click the button.

Notice that the default for:
Select Chrs (chromosomes) is ALL
Select Probes is Probe Set
Options: Permuation test YES  (1000 is the default number)
Options: Bootstrap test YES (1000 is the default number)