RocketChat offers several ways to create a reminder. Whenever you want to make a reminder out of a message you received (or sent yourself) you can hover over the message and click on the ⋮ icon. Then click on Remind me about this and fill in the pop-up to set your reminder.
You can also create reminders at any given moment by typing any of the following commands as a message in RocketChat.
/remind – Opens a pop-up to create a reminder for yourself or a group of people.
/remind #channel – Opens a pop-up to create a reminder for a specific channel
/remind @user – Opens a pop-up to create a reminder for a specific user or users.
/remind list – List all your reminders.