To add Web Feature Service into the Datasource Manager:

1. Select Datasource Manager from the Tools tab.
2. Click Add WFS in the Source Browser.
3. Write a WFS name and URL of the dataset.
4. Select Get Info.
5. Select a layer.
6. Click Save button.

WFS is added to a project as shown below:

1. Select Add Layer from the Layer tab or Map tab.
2. Select Web Feature Service in the Source Browser.
3. Select WFS layer.
4. Click Select button.