How I give multiple shifts to the same employee on the same day?

It appears in the HR module, that I cannot give multiple shifts (of different times) on the same day. How do I do it?

This could be pssible if the data type of Start and End Date fields include the time component. Try changing the data type to DateTime

How do I edit that? It say I don’t have the permission to edit it. I’m assuming this mean I have to turn on developer mode?

You have to turn on developer mode and login and System User. Then open the DocType so you can edit fields.