Review Settings and save them to web.config
Kartris presents details of the changes that will be written to your web.config file. If the Kartris installer doesn't have the correct permissions to write to this file, it will give the option to download the web.config file. In this case you'll have to manually replace the existing web.config file (either via FTP if you are installing on a shared server hosted by an ISP/hosting company, or using Windows Explorer, if you are installing on a local system)
Once you have updated the web.config file, you have essentially completed the setup of Kartris. The final step is really just confirmation of this, and provides links to the front and back ends of Kartris.