What are the sc child support laws

Hi my name is Phyllis Johnson I am sending this on behalf of my husband Shannon Johnson.I need to know the child support laws.i can't afford a lawyer to defend me and eveytime I go to court I lose and end up in jail.I have had a job and if i get a little behind in support my ex takes me to court and I end up going to jail and lose my job.Then when I finally get out of jail i have to find another job.And by that time I am behind in child support again and she has me back in court and me with no lawyer and can't afford one to defend me i end up in jail yet again and if i have found a job by then to try an catch it up i am in jail and lose that job.So I am in desperate need of some help with these laws so I can represent myself cause I can't afford a lawyer to defend me.