From mail2web.com Wiki
Where can I find help for your web client?
To log in to your chat account using our web-based Jabber client, you can go to http://webclient.chat.mail2web.com. Once you have logged in and launched the web client, click on the menu in the top-left corner and select Help. This will open a help window which provides information on various aspects of the web client.
If you are using a third-party software client, please consult the help manual or documentation for that client.