Can I create one generic user for all chat sessions?

Can I create one generic user for all chat sessions?

Yes, you can. You need to register QuickBlox account http://quickblox.com/signup/, log into your admin panel and add your application. Then get tokens and keys to access your application (check details here http://quickblox.com/developers/5_Minute_Guide).
After this you will have one primary user to work with QuickBlox and all its modules.