Where to pay social security for flexible employment in Xin 'an County in April 2022?

According to relevant information: Social Security Bureau. Flexible employment social security does not need to be paid according to a fixed standard, and can be handled by the local social security bureau in Xin' an County. You can freely choose the payment level of social security according to your own needs and specific circumstances. You can only pay endowment insurance and medical insurance, but you can only apply for local household registration.