When you do a slipped stitch on seed stitch, you do whatever the next stitch should be based on the previous row. If a purl is facing you, knit it, and vice versa.
I will warn you, though, that if you've been working the edge stitches up to this point and now start slipping the first stitch, the edges will change in appearance.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry