To tell someone you remember them, visit their profile and select a word or words under the How do you remember section. To keep the I Remember You feature quick and upbeat, it's not possible to add your own words to the list.
The words you choose will immediately be added to this person's profile. Currently you can only share 10 adjectives per profile to remember someone. If you'd like to tell someone more about how you remember them, try leaving a public Profile Note or sending a private message.
You'll also see the Remember option featured in your Class List. By clicking Remember next to someone's name in your Class List, you can let them know that you remember without choosing a word or words to describe them.