To purl into the front and back of a stitch, purl into the front loop as normal, and don't slide it off.
Then bring your needle around to the back and insert it from left to right into the back loop, twist the needle around to the front in 'purling position' and purl it. It can be awkward, but it's doable.
"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