Forum will ask you to register and login and then only you will be able to see that thing. You will probably find some another alternative rather than registering (then let it be free!) to any website. After registering, there is no guarantee to get complete and correct information so, why not try to get in and browse everything without registering?

These websites generally doesn’t allow unregistered users or guests to enter but they do allow “Google Bot” or any other search engine bot to enter for crawling purposes. This trick by Nakodari works on same basis- You will need to change user agent to Google bot for browsing forums.

What you need is Firefox Browser and User Agent addon After installing, create another user agent from the options menu of the addon.

Select User Agent from the left sidebar and click Add. Now in the description field type:

crawl-66-249-66-1.googlebot.com

and in user agent field type:

Googlebot/2.1 (+http://www.googlebot.com/bot.html)

Now Start browsing by selecting the user agent as Google Bot.