I'm assuming you did a yo on the previous row. On this row, work a yo, and then purl the next stitch together with the previous row's yo.
It would work just as well to say yo, purl next two stitches together, but specifying that one of those is the previous row's yo helps you to keep track, I imagine.
"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