what is wyib, slip 1 st.knitwise tbl.

With yarn in back, slip one stitch knitwise through back loop.

wyib, slip 1 st. knitwise tbl.
With yarn in back of work, slip one stitch knitwise throught the back loop.

OK I understand the slip 1 knitwise, but an not sure how to slip 1 knitwise tbl? Is this to twisting the stitch?

Yes, you slip the st with a twist in it, just as if you’re going to knit it through the back loop only move it to the R needle and make sure the yarn is in back of your work, not in front.