Go to the "Employees" from the left navigation bar.
Click on the relevant employee's card then click on the "Career" tab on top.
If you are defining a new career click on the "Add position" button. If you want to edit the position information click on the "..." icon from the left and select the "Edit" option.
If the unit you want to assign to the employee does not exist, you should update your company structure. This article can help you for this issue.
Notice: When adding a new position you will see "Start date" and "End date" columns. It shows employee's start and end date for that particular position. If you are adding a position for a new employee, you should choose the employees' start date for their employment.
Keywords: career, position, adding a career, adding a position, edit the position, edit the career info