This form is available here for download. Fill out and file in duplicate Form 424, Certificate of Amendment.The attached form may be used for filing articles of amendment for a limited liability company. Texas LLCs will have to submit 2 copies of the Certificate of Amendment to the Secretary of State. This form is used to change or add terms to a contract that has already been executed. 39-9 Redline 11.2022. Texas Amendment to an LLC Operating Agreement. Use our LLC Operating Agreement Amendment form to modify your original agreement. The first step is to file a form called the Certificate of Amendment with the Secretary of State and wait for it to be approved. Filing Fee: Submit the completed Form 424 along with the required filing fee to the Texas Secretary of State.