How to divorce

We separate from each other almost 5 years. I tried file divorce but for some reason it delayed until now.

I would like to end the marriage ASAP. However, I don't know his address.

I would like to know how I can finish this. I have two kids, who live with me since separation. And the DAD did not pay any cents and paid very few visits.

How can I collect the child support before divorce?

Thanks!