• On the first step you need to register your nessus, on bt5 click on Application–> Backtrack–> Vulnerability assessment –> vulnerability scanner–> Nessus –> nessus register 
• You will be on a web page of nessus, you can use the link to do the same thing.
• On the website click on home feed for free or if you want to use nessus at your work than choose work feed.
• After a short registration form you will get an email from nessus with your activation code.
• Open the terminal and type the command below to register your nessus.

/opt/nessus/bin/nessus-fetch –register YOUR CODE HERE

/opt/nessus/bin/nessus-fetch –register A894-7673-3A9B-768A-6008

• On the second step add user(s) on your nessus, click on Application–> Backtrack–> Vulnerability assessment –> vulnerability scanner–> Nessus –> nessus user add
• Enter the login name, password, if you want to make the user as the admin than follow the procedure, on rules just press enter.
• You are almost done, now this time to start your nessus, click on Application–> Backtrack–> Vulnerability assessment –> vulnerability scanner–> Nessus –> nessus start

• Now open your browser and type https://127.0.0.1:8834/ use the user name and password that you have enter on previous steps, your nessus ready to scan.
• For the first time it may takes some time to be start.
• For more backtrack 5 tutorial click here.
  

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