It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Have all the details of your reference in front of you:
Type your reference in:
Under the Collect tab, select "New reference"
Choose the correct Reference type from the long list. Warning: this is not always as easy as it sounds. Note the difference between Book and Edited Book, or Journal article and Electronic article.
Enter the data into all relevant fields. Note: You do not have to fill every field, but there is lots of room here for your research notes, extra keywords and much more that might (or not) be useful.
When Saved, the reference will be in your library and ready to use.
Copy and paste from a reference list or bibliography, a database, or even direct from a pdf. Follow the instructions above to open a new reference and then paste the data into relevant fields. Note: This method is quite clumsy and time consuming in EndnoteWeb and you will probably not want to do this too often. Typing in the data is often just as fast, but copy-and-paste may be more accurate with long complex titles.