Orias «My account»-function gives you an overview of your loans and requests. From there you can renew your items, as long as they are not requested by another patron. Items may be renewed in Oria for three loan periods.
Go to the Oria front page, and locate the Sign in-button in the top right corner. Sign in with your NLA username and password. Click «My account», in the top right corner. Here you see the items you have on loan, and whether or not they are renewable. Interlibrary loans and items with status «recalled» cannot be renewed.