1. Go to Site > Settings > Custom Text
2. Scroll towards the bottom of the page where you can find "Applicant and Administrator Sign In Instructions" and "Reference and Reviewer Sign In Instructions"
3. If you have Local or Whitelist Authentication, you will also have a "Sign Up Instructions" section as well
4. Edit the instructions as needed
5. Click the green Update Instructional Text button in the lower right hand corner to save your changes