As you're binding off under the arms you could do a knit bind off and purl the rest of the row, but it's better to get in the habit of doing the bind off in purl, using the Basic Purl Bind Off in the Free Videos, Binding Off Section at the top of the page, and purling the rest of the row.
The last two rows are the 'Decrease row (RS)' and the 'Following Row (WS)'.
An English Knitter (nationality and method).
FO: Downton Hat
Call me either Clutter or Julie (my real name), if you find it easier to type than Dclutterchique.