You can start assigning assignments to your students by following the steps below:

1. Go to your Workspace tab.
2. Find the assignment you want to assign.
3. Click on the Assign button.

You have the option of assigning the assignment to individual student(s) or entire group(s). The steps given below are to assign the assignment to one or more groups:

4. Under the Assign to field, select Group(s).
5. Check the boxes next to the groups you want to assign the assignment to. You can select one or more groups.
6. Click the Right Arrow to move the selected groups to the Assigned List.
7. Once all desired groups are selected, click Next.

On the next page:

     8. Select the Start date and End date for the assignment.
     9. Click Next to continue.

On the final page:

    10. Review all the details and click the Assign button to complete the process.

    11. Look for the message "Your assignment has been assigned successfully".

Reference to other relevant help documents:
Creating a My Group
How to Create Assignments