1. To participate in insurance in an individual way, you need to apply to the social security bureau (Guangshui Social Security Bureau) where your household registration is located. Insurance procedures include: my ID card, two recent bareheaded one-inch photos, insurance premium, application form, etc. And can only apply for pension and medical insurance.
2. You can pay social security in a company in Wuhan, but you must pay the premium in full (including the part paid by the enterprise). Moreover, you are close to retirement age. If you pay less than 15 years before retirement, you won't get the overall fund. You can only get a personal account, so all the social security fees you pay can't be yours. Or you have been "working" since you reached retirement age until you paid 15 years.
I suggest you consider buying commercial endowment insurance and medical insurance. (If you have personal social security in Guangshui City) Because it is difficult to reimburse social security for medical insurance in different places, even if it is reimbursed in different places, the reimbursement ratio will be correspondingly lower.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.