Can I change my passport to married to single...

If your inquiry is about changing the passport from married to single, find the following information:
It is possible to change any statement of the passport data, and in particular, if the person is married and the divorce took place, he can change his status and transferring it from married to single, provided that there must be a document proves the divorce.
Knowing that, you can refer to the embassy of your country to change your marital status recorded in the passport