In general, to add a Library resource to your D2L course, add a new Topic (item) to a Module (folder). Also, in general, add the new content as a Quicklink.
The tabs on this guide represent types of resources which we assume that you may want to use. Feel free to contact us if you have a question.
IDDS has a thorough tutorial which leads you through the steps of adding a new Topic (item) to a D2L Module. Questions of a nature more specific to D2L may be answered on the IDDS web site.