RB1803

Thank you. My question is around making Class 2 contributions, not Class 3. How do I ascertain my eligibility for this?

I have made four years of NI contributions and according to GovUK, I can make voluntary contributions. My question is, how do I apply to make Class 2, rather than Class 3 contributions? According to GovUK, I can make contributions for the years 2007-2021. I have lived out of the UK since 1996 and was either a student or self-employed (author, landlord, and manager of personal wealth). Am I eligible to make Class 2 rather than Class 3 contributions? If yes, how do I do this?