A course manager can assign enrolled users into groups manually.

Go to the Administration block and click on OpenLearners.

In the list of names of enrolled users is a column for Groups. Click on the pencil icon (Edit groups) for a user and choose the appropriate group from the drop-down list that appears. Forum moderators can have more than one cohort group to moderate, whereas learners will usually only be in the one cohort group they were assigned to when they used the key during enrolment.

It is also possible to add or remove users from a cohort group via the Groups screen by clicking on the group’s name and using the Add/remove users button.