How to slip 1 wyib

Can someone please help me! This is one of my first times following a pattern and I’m a little confused.

These are the instructions for the stitch I need help with
Row 1 (WS): Purl .
Row 2: K1, *sl 1 wyib, K3 repeat from * across.
Row 3: *P3, sl 1 wyif, rep from * across, end p1.
Row 4: K1, * drop sl-st off needle to front of work, k2, then pick up dropped st and knit it, k1, rep from * across.
Row 5: Purl.
Row 6: K5, * sl 1 wyib k3, rep from * across.
Row 7: *P3, sl 1 wyif, rep from * across, end p5.
Row 8: K3, * sl next 2 sts wyib, drop sl-st off needle to front of work, sl the same 2 sts back to LH needle, then pick up dropped st and knit it, k3, rep from * across

I need help with the WYIF and WYIB. Does it mean the RS is the front, or is the side facing me the front?

I think I can handle the rest.

Thanks for your help.

With yarn in back (wyib) means you slip the stitch with the yarn in the back of the work like when you knit. With yarn in front (wyif) you bring the yarn forward as if you were going to purl and slip the stitch then move the yarn back if you’re knitting the next stitch.

The side facing you is front whether you’re working on a RS or WS row. The other side is the back.