Do you know how to add a component?
In Schematic view, click the logic symbol with a black arrow - found to the right of the X symbol (Delete) on the toolbar at the left of the screen.
From the dropdown list which opens in a new window, scroll down to 'pinhead' and click the + to expand the tree.
From there, scroll down and select 'PINHD-1x11', then click 'OK'. The new window closes and you are back in Schematic view, with an outline of the 1x11 pin-header.
Click once to place a header, then move the mouse and click again to place another. Once you have both headers placed, hit the ESC key.
Switch to Board view - the icon on the menu bar beneath File Edit Draw...etc, which looks like a logic symbol above a chip outline.
Arrange/rotate the headers so that one is horizontal and the other is vertical.
As noted in the other post from yesterday, select the layers 16 & 17 only, then print your board.
Measure the from the CENTRE of pin 1 to the CENTRE of pin 11 and you should have exactly 1" if your settings are correct.
Does this help?