How to "Join Stitches in the round"

[andromeda]

Hi,
I am newbie to knitting. I have a pattern for knitting a hat for a newborn. The first round is Cast On stitches. I just finished that round. But now the instructions say " join to work in round". I do have the instructions to join, but its still confusing. I have 2 needles, wool yarn. All the CO stitches are on my left needle and the right needle has no stitch (or the last stitch) on it. Both the instructions and the video on this site show how to "join in the round" with circular needles, but how do i join with two straight needles? Please help.
Thanks in Advance!