EndNote Basic / Online lets you add references to your EndNote library in several ways, including:
When possible, take advantage of the import option offered through library databases:
From EndNote: "Use the Capture Reference feature for online resources that do not have options for direct export. Capture Reference scans the bibliographic information presented on a Web page and creates a reference for you to save to a new or existing group. Some databases, such as PubMed, allow you to capture an entire page of references at once."
To enter a reference "manually":
You can connect with library catalogs and databases through the EndNote interface.
EndNote can import references saved in a consistently tagged plain-text format:
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