Re: Gaining experience
You log into your account and go to office, then to settings (the crossed hammer and wrench, I always overlooked it back in the day when someone told me to go to the settings ), then you see on the right side "Signature", it's the second last option. There you copy the BB-Code, then you go to the forum, click on profile, then signature and there you insert the code you copied before.
I'm not 100% sure you already can create a custom signature in the forum, it's linked to the amount of posts you created, but I believe you should have enough.