Introduce yourself. Start a new topic labeled "About (Your Username Here)" in this subforum.

Give a brief overview of your political and religious beliefs.
A few good ones to brush over are:
•feminism
•if you are religious or not
•gay and LBGTQA rights
•if you have a Tumblr
•gun rights
•political party association
•your stance on any current events

After this you may add opinions by adding posts or updating your first one and others with similar views can talk to you in your own thread or someone can ask you to clarify on your views and what they mean.