I’m making a purse that has two straps, which meet at the top to make one big strap with the knitchener stitch.
Like this :

The instructions had me divide my base stitches in half, keeping one half on a stitch holder, working the second half up.
Now that I’m done with one of the straps, I have to go back to work whats on my stitch holder.
How do I cast on the yarn there? I’ve got stitches, but no working yarn.
Thanks! 
(This is the “infamous hobo bag”, as seen on this website.here )
Here is a photo of my project. On the right bottom shows my stitches on the hook that need casting on. On the left side is the finished strap
