You start by opening the common language window.
Hidden: show
Type what skill you want to roll in the format below. They aren't case sensitive.
Disguise = .roll disguise
Escape Artist = .roll escape
Sense Motive = .roll sense
Knowledge: Arcana = .roll lore
Knowledge: Arch-Engineering = .roll architecture
Knowledge: Dungeoneering = .roll dungeoneering
Knowledge: Geography & Astronomy = .roll geography
Knowledge: History = .roll history
Knowledge: Local = .roll local
Knowledge: Nature = .roll nature
Knowledge: Nobility and Royalty = .roll nobility
Knowledge: Religion = .roll ??? - not currently working
Knowledge: The Planes = .roll planes / .roll theplanes
and voila. Credit to Zanniej or whoever told him. *edit* and Endelyon! Totally copied her fancy colours n stuff and added lore skills.
Happy rolling!