Meanwhile found on forum.conduit.com: How can users uninstall the toolbar?
Toolbar users can easily uninstall their community toolbar at any time with Conduit’s standard uninstall package (Add/Remove Programs in Windows, Add-on Removal in Firefox, etc.).
FireFox: as you would do with any FF add-on: Top browser navigation: click TOOLS-> Add-ons-> select the item you want to uninstall.
Internet Explorer: as you would with any windows installed component: Control Panel-> Add/Remove Programs (Programs & Features on vista)-> select the item you want to uninstall.