What do I do if I have a b1b2 visa and I want to green card?

You need to meet with an attorney to discuss your options.

In general, eligibilities to adjust status to become a Lawful Permanent Resident (to get a "Green Card") fall into two main categories: family-based applications and employment-based applications. If you believe you may have a family relationship or employment opportunities that could form a basis for adjustment of status, you should consult with an immigration attorney. Upon learning all of the relevant information about you and your family relative and/or employment opportunity, the lawyer will be able to advise you about eligibilities, options and strategies.