My husband is the owner/broker of a real estate company single member LLC. I, his wife works as an independent contractor Agent. How can I get the income to get SE Tax?

[theckt]

He has been claiming all the income in the past. He doesn't need the SE Tax. He's getting SSI. So, I would like to pay into SS so I can get the benefit. We file Married filing Jointly. How do we need to file? Do I need a separate schedule C? Thank you.