Only Traffio users with the "Person Social Inclusions Access Level" permission can set and modify an individual's gender and pronouns.
By default, this permission is enabled only for Managers.
How To Set Employee Gender & Pronouns
Navigate to People on the sidebar
Select desired Employee
Scroll to Person Information - there are dropdown lists for Gender and Pronouns
Select Gender
Select Pronouns
Click Save
By default, they are set to Unspecified