To simply and quickly enter the chat all you need to do is enter a nickname and then click the 'connect' tab at the bottom. All the other fields are optional or are already set for you.
If you then wish to rigister your nickname so no one else can use it simply enter this command on the input line /msg nickserv register password email
password should be replaced by a password of your choice 5 characters or more and it is case sensitive
email should be replaced by your email.
Then in the future when you wish to connect to chat enter your password and nickname in the required fields, click the 'connect' tab and you will be automatically logged in as your nickname. If you enter your password incorrectly you nick will be timed out after 30 seconds.