Users are assigned to groups, which can be done in the groups tab, where you can add existing users or create users for that group from scratch.
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Start by heading to the groups tab.
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Select the group you would like to assign a lesson to.
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This will take you to the group management page, where you will be able to see each aspect of the group.
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From here, select the lessons tab, and you will be able to manage lessons for this group.
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When you are ready to add a new lesson, just click the green "Add Lesson" button and
select the lesson you would like to assign, then pick a start date and you are good to go!