Specialties
You can add specialties in the character wizard or later, with /specialties add.
Adding specialties
/specialties add specialties:<TRAIT1>=<SPEC1>,[SPEC2],... [TRAIT2]=...
You can add several specialties at once.
Example: Nadea has a Medicine specialty called Cadavers.
/specialties add specialties:Medicine=Cadavers

Removing them uses the same syntax:
Removing specialties
/specialties remove specialties:<TRAIT1>=<SPEC1>,[SPEC2]...
Listing specialties
/traits list shows your specialties near the bottom:

Rolling
To roll with a specialty, use dot syntax: a Brawl specialty called Kindred is brawl.kindred.

Shorthand works here, too: brawl.kin, b.k, or even .k, as long as it's unambiguous.
The specialty adds a die to your pool and shows in parentheses after the Skill, like "Brawl (Kindred)".
