2. How to pay the premium before signing the contract? This is not good. And after signing the contract, you still have 10 days of hesitation. In these ten days, you surrender your insurance and the premium will be fully refunded. Didn't the insurance salesman make it clear to you?
3. The insured can't change (because different insured have different occupations, ages and health conditions, the rates charged by insurance companies are different), but the insured can change.