Try using the Edit Node cursor, however note that you've got 2 lines, exactly on top of each other so their selection points will be in exactly the same place. For the purposes of selection, the thickness of a line is ignored and you can only click on the 'hairline' element of a line to select it.As the black line is on top of the yellow one, you'll wind up selecting it as it's at the top of the stacking order. There isn't an easy way to select the bottom-most of two identically shaped, exactly over-lapping objects; Stardraw is designed to select the topmost object at the co-ordinate where the selecting click occurs.