To consolidate your stitches: Divide stitches evenly onto two needles holding them in your left hand with the working yarn on the right as if you were going to resume the knitting (The stitches to be worked are on the front needle and the stitches you just worked are on the back needle.) The next step will be to k2tog using one stitch from the front needle and one stitch from the back needle. Now let's break it down. For the purpose of this instruction I have used contrasting yarns.
Step 1: Divide Stitches evenly between two needles
and hold them in your left hand. (For tubular pieces, be
sure that the stitches you just worked are on the back needle.)
Step 2: Insert right hand needle knitwise into the first stich on the front needle. Do not slip the stitch off of the left needle yet.
Step 3: Insert right hand needle knitwise into the first stitch on the back needle.
Step 4: k2tog.
Repeat Steps 2-4 until you have consolidated all stitches.
This is what the wrong side will look like...
...and this is what the right side will look like.