How to assign borrow/return textbooks rights to the Textbook storage?

To assign borrow/return rights, see:
User rights - Overview
Assign the "Right to borrow and return textbooks from Textbook Storage" to the user.

See also:
How to assign administrator rights to the Textbook storage?
Enable teachers to borrow textbooks for themselves.
Enable teachers to borrow textbooks for themselves and for their students.