If your employee's function should change over time, you can, of course, edit this. In your settings go to Resources/Employees.
Now select the three dots in the upper right corner of the respective employee and click on Edit employee.
Under "Job title" you can enter a new name. If you want to record the function in several languages, activate the first slider "Multilingualism". Now you can translate all fields for the activated languages. Then click on "Save".
Now your employee has a new job title.