Can be accessed from User Settings → Post to Twitter on the top menu bar.
Before you go ahead, please confirm that you've connected your Twitter ID with Wavespot.
In this page, you can configure the message that shall automatically be tweeted out when someone logs into Wavespot at your premises and starts using free Internet.
For example, if a customer named Shayon just logs into your location named Coffee Bean Cafe, then the following setting shall send out an automatic tweet that says -
Shayon has checked into Coffee Bean Cafe, and is currently online using Free Internet from #WavespotWiFi