Content categories (previously called labels) describe what you post about. Brands choose the categories they want for each campaign, so picking the right ones helps you get matched to campaigns that fit.
To set them:
Go to "Settings", then "Profile" (creators.thecirqle.com/creators/settings/about-me).
Under "Content Categories", pick the 3 that best describe what you mostly post about.
Click "Save".
You need exactly 3 for the page to save.