I was a H-1B visa holder before. After my H-1B visa expired, I over-stayed in U.S. and married a U.S. citizen thereafter. Please let me know how could I apply for the waiver of 3-year and 10-year bars inside the United States? so I can apply for my immigrant visa and Green Card? Thank you very much

Applying for the waiver of 3-year and 10-year bars requires the USCIS form I-601A filing. Decisions regarding the provisional waivers are made by the USCIS National Benefits Center. Simply filing USCIS form I-601A application does not grant status or any legal privileges in the U.S. Even its approval does not grant any immigration status or benefit. 

It remains necessary for you to depart the U.S. and undergo the visa application process at an appropriate consulate. In addition to qualifying for the waiver, you must separately qualify for an immigrant visa. There are a variety of risks in this process, and various procedural considerations.