Lady Eleanor Selvedge Question

Hi all,

I would say I’m an intermediate knitter and I’m learning as I go with the Lady Eleanor Shawl pattern. I know it’s a fairly common one, but I am really confused when starting with the two middle right slanting diamonds (after the left side triangle).

How (and where) do I pick up the stitches to purl along the selvedge edge? Is it the area that’s between the two needles? Is it as easy as sliding these stitches onto the left needle and purling them onto the right??

I feel like this is so easy, but the entire ‘selvedge’ part is really confusing me. If anyone can explain this better, or point me to other posts, I would be so appreciative. Thanks!