Multiple Employers

So I have worked at various qualifying state agencies over the years and never submitted a pslf form.

I have tried to look for the information online but I am confused - do I need to submit a form for every separate employer from the past? How do I do that? Just contact them?

Also, my current employer will not sign my form even though they are a qualifying employer. I am not sure why, it is the only email they will not answer. How do I handle that?

Thanks so much.