You can save sources directly from your browser to either your desktop version of Zotero, or your Zotero.org account.
Make sure you have installed the Zotero browser connector. If your Zotero browser extension is installed correctly, you will see a folder, book, or article icon in the upper right hand corner of your browser:
Click the icon to save a reference to Zotero. It's that easy!
You can add sources using a standard identifier like ISBN, DOI, or PMID:
Or you can enter information by hand: