If there is no separate button for direct export from the database, you can download the reference to your own PC or MAC and then import the file into your EndNote Online library.

Tick the references you want to export to your library.
Find a cite, export, or save button in the database and save the file on your computer.
Upload the file to your online library, under Collect and Import References
- Choose the right Import Option based on which database you have downloaded the reference file from. If you have a RIS file, you can in most cases use RefMan RIS as the Import Option.
- Choose which group you want it in, To:
Make sure that all necessary information is included, that it is error-free and in the correct field. Also check that the correct reference type is specified.

Point 4 is particularly important as references obtained from databases may contain errors, or information that you don't want in the library. A good rule of thumb is to check the reference when you export it to make sure it looks correct. Use the Source Compass if in doubt about the reference type or required fields.