Thank you very much. I can see I'll have to practice. When the Debbie Bliss book says "purl up" you pick up the stitches from the selvedge.
I'll have to check out the tutorials and then try to work the stitches.
Purl up would be picking up sts along the side of one of the triangles (or blocks) purlwise with the WS facing you. The tutes will get you going on the concepts of making the triangles and squares and picking up stitches.
I hadn't realized that entrelac was a knitting style. My introduction to it has been rushed, but now I can see that it looks like fun. I've finished the triangles and the first two rectangles (I made 5 triangles to simulate my finished project) and now I can see how it works. Who first thought this up?