From your Dashboard
Below your profile picture, in the left hand panel of your dashboard, you'll see your current Hosting Availability and a downward facing arrow (v) you can click to edit it.
From your Profile
To update your Hosting Availability, also known as your Couch Status, first go to your profile and click the Edit Profile button.
Once on the Edit Profile profile page, you will see your Hosting Availability field. After updating your availability, click the Save button to save the change.
Members with their Hosting Availability set to 'Accepting Guests,' 'Maybe Accepting Guests,' or 'Wants to Meet Up' can be found in Host Search (members with 'Wants to Meet Up' set will only display if members apply the Wants to Meet up search filter). When your availabilty is set to "Wants to Meet Up" or "Not Accepting Guests" other members will not be able to send you Couchrequests.