You will always need to have a pool ready to welcome your new stations. If you haven't created a pool yet, please read How to create a new pool.
Click on "Stations" menu on the bottom of the page
then, click on "+ Add pool or station" button on the bottom right of the page
A pop-up menu will appear on the right side of the page. Click on "Add new station" button.
The pop-up menu will change to let you add the station's details. Fill in the information for Chargebox ID and select the Pool where the station should be added. Then, click on "Update and close" button.
More about the Chargebox ID