Applicants can be tagged individually via their Applicant Profile.
To add a new tag, first navigate to the Applicant Profile and click on the Tags icon, near the top right. Select Add New Tag from the dropdown menu.
Type the tag name in the Add New Tag field. To add multiple tags at the same time, type all of the tag names at the same time, and separate them with commas. The colour of tags are grey by default; click on the grey square to choose another colour for the tag. OpenApply will suggest the names of tags that already exist in the system. Click + to add the new tag.