You can access and edit your HQ and on-demand listings by logging in to your host dashboard here.
This will show your long-term office listings; there is an edit button on the right hand side which will allow you to edit your listing.
You can also edit your on-demand workspaces by selecting 'on-demand' on the top right.
For future reference, you can find this link by clicking onto 'Login' in the top right hand corner of the page, and then 'Host Login' where you can access/edit your long term offices and on demand workspaces.
For more information on accessing your Host Dashboard and bookings, here is a useful article which may help.