Administrative users make forms available to candidates in Interfolio by adding these forms as requirements in the Candidate Requirements screen. Then they use Interfolio's email feature (if their permissions allow them to access this feature) to write a message asking the candidate to log in, fill out the form, and submit it.
For a more detailed discussion of using Interfolio forms, see the articles on candidate certification linked below.
See Also
Opus Support Site Articles
How to Submit a Form in Interfolio
How to Access Case Materials as a Review Candidate
How to Access Interfolio for Faculty
How Does Candidate Certification Work in Interfolio?
Interfolio Help Center Articles
Add a Required Form to the Packet Requirements for a Case