When I join mine I take the 1st cast on stitch and slip it onto the other needle and then take the last cast on stitch and slip it over the stitch I just put on that needle and then put it onto the other needle. If you have the correct number of Co stitches you boobooed somewhere...we have all been there. All you have to do it check them and frog them out to that stitch. Sorry, hope this helps some...
Blue Mound, Ks