Warrior Forum is more strict than before, secondly why you are still focus on signature. GROW UP BRO
They will allow you signature only when you reach to expert level or get their premium membership.
But at the end of the day, you will find that their signature are also "Nofollow" which is freak.
No one reputed discussion board will allow to put your links on their web and dofollow is just a dream
Just focus on your blog or website to make it popular and write about it on external blogs or communities instead of putting links at the day first. Hope you understand!