Dumb question I know, but I'm having a hard time completing step 4 of the instrux which is basically "Lower the boot by pushing the two retaining tabs in the positions shown." The tabs are under the leather boot but I am having a hell of a time locating them and completing the operation. I found what I think are the tabs, right under the boot stitching; maybe I am pressing them the wrong way or something? Any advice is appreciated.