To add/edit your space's amenities:
Log in to your dashboard
Go to "Settings" and click on "Listing Details"
On "Listing Details", go to "Amenities" and click "Edit" in blue on the right
To add an amenity, click on a box, and enter the title and description of your selected amenity
To edit an amenity, click on the box you wish to edit, and enter the title and description of your selected amenity
To remove an amenity, click on the box you wish to remove, and click on the "X" button in the upper-right corner to remove the selected amenity