HOW TO GET IN THIS WEB SITE ??

No, you can ask any questions exactly the way you asked this one. You might want to turn off the CAPS LOCK if you are looking for many answers.

If you are using a PC, try looking round the back for a colour coded forum switch.
As you have already managed to register and log on, I would guess that your forum switch is already in the "on" position and if it is, then no further action is required.
If you are using a tablet or mobile phone, you can tell whether the forum option is activated by simply turning the item upside down.
If the screen rights itself so it appears upright again to you, your forum option has already been activated.
Usually the default factory setting is "forum on" nowadays.

OIC