Step 1:
Navigate to the Sources screen. You can access it via two ways: 1) on the Projects screen, click the project's "Sources" icon in the "Contents" column,
or 2) open your project by clicking on its title, which defaults to the Sources screen.
Step 2:
Click the green New Source button in the upper-right corner.
3. On the Sources screen, pick the Source Type ("Where is it?"):
Website
Then "Web Page"
4. Complete the fields (pop up help boxes will guide you & offer tips)
5. Click "Save" to add the source to your Sources list