I was getting my hair done and was asked several times by the lady could she set me up with Nigerian man and how much would I charge.. so he could his citizenship... Than she said someone would was doing it for her... She has several clients and all
Of them have been asked can I report her

Yes, you can.

Yes, you can.

How do I do it

Call up the local immigration office, in the US the ICE office.

But you don't automatically get citizenship by getting married, But arranged marriages are common. And why don't all the other people report it ,