2 sentences

1. 你应该按时缴纳保险费。

   nǐ yīng​gāi àn​shí jiǎo​nà bǎo​xiǎn​fèi.

   You should pay your insurance premiums on time.

   Source: Dong Chinese Dictionary

2. 投保人应当按照合同约定按时缴纳保险费。

   tóu​bǎo​rén yīng​dāng àn​zhào hé​tong yuē​dìng àn​shí jiǎo​nà bǎo​xiǎn​fèi.

   The policyholder should pay the insurance premiums on time as agreed in the contract.

   Source: Dong Chinese Dictionary