1. Go to CMS Desk -> Content -> Corporate Site.
2. Switch to the Design tab and right-clicked the txtTrialInfo webpart at the top-left and choose Remove.
3. Click Ok to remove the bar from your website.
That's how you remove the signing-in bar from your web site.
Page url: http://devnet.kentico.com/docs/devguide/index.html?removing_the_signing_in_bar.htm