1 What if I lost the password from to my Private room?
There are three ways to restore it:
1 Check your sent messages box, you probably invited someone and provided them with the password.
2 Ask your friends whom you invited to your room.
3 Contact the site administrator and ask them to provide you with the password.

Extraordinary (radical) solution - Contact the site administrator and ask him to remove your room and create a new one.

2 Which additional plugins should you have to be able to use the chat?
The most important plugin is a Flash Player version 9.0 or higher.