Correcting a knit stitch to a purl stitch

#1

I dropped my needle and after reinserting it my last 2 stitches, which should have been purl stitches, look like knitted stitches. How can I fix this? Thanks

#2

go here: http://www.knittinghelp.com/knitting/basic_techniques/misc.php
it’s under “Fixing Mistakes” called "Correcting a stitch without unraveling rows. "