Click on the + Add button; from the New item menu you can select:
Search the library - Search the library’s catalog, Educat+, and select an item
Add from favorites - Select an item you may have saved to your Favorites folder in a previous session
Add from ISBN - Add a book's citation to a section of your list by entering an ISBN
Import References - Add from a citation manager you have previously linked to your account
Manual Entry - Choose a resource type and fill out a blank form to add an item