How can I extend the loan period for borrowed media?

How can I extend the loan period for borrowed media?

Log in to your library account using your IdM ID or UB-ID and the corresponding password. Your account balance shows all borrowed items. You can now extend the loan period of individual items or renew your entire account. Please note that the new loan period begins on the day of renewal.

Items that have been renewed six times cannot be renewed. Subsequent renewals are also not possible.