After the contract is printed, you can add terms manually. According to the law, both parties need to press their handprints or signatures beside the handwritten additional clauses to ensure their effectiveness. If there is no signature or fingerprint, both parties acknowledge that the modified content is the result of negotiation between the two parties and is also valid.

legal ground

Article 543 of the Civil Code: The parties may modify the contract through consultation. Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when the parties sign, seal or fingerprint it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.