plug-in is not maintained currelty, please check alternative at https://github.com/bnbeckwith/pintaboard
This is basically just a cut and paste job on top of Thedward Blevins' Pinboard adaptation which is a basically just a cut and paste job on top of the wonderful Delicious plugin by nikolai.weibull.
See Pentadactyl's plugin installation instructions.
Install these plugins by copying them to the ~/.pentadactyl/plugins/ directory (or %USERPROFILE%\pentadactyl\plugins on Windows).
Use the rinboard
command in Pendatactyl.
Shortcut rin
Such a name is used due to a conflict with the Pentadactyl "pintab" command.
:rinboard -description Description\ for\ current\ page tag1 tag2 .private-tag
:rinboard tag1 tag-other -description "Another way to make a description"
If asked by Firefox, enter your standard username and password for Pinboard. There's no need to create a separate API account.