Specify the loads imposed on our foundation by the columns

Do either of the following:

Select the Loads & Factors > Add a Column Reaction Load entry in Main Navigator.

or
Right click on Load Case 1: Load Case 1 entry in the Load Description Tree and select Add Column Reaction Load from the pop-up menu.

The Load Data pane opens a form for entering nodal load information.
Type a value of 5 in the Fx field and a value of –5 in the Fy field.
Then click Add to accept the load input.
Note: Negative and positive values follow the sign conventions of the axis system. Negative values are downward, compressive forces and positive values are upward, tensile forces.
The load will now appear under the Column Reaction Loading folder in the Load Description pane.
Repeat steps 1 through 3 to add a column reaction load to the "Live Load" case with Fz = 10 kip.