You probably received a ticket under Sec. 545.104. SIGNALING TURNS; USE OF TURN SIGNALS.
(a) An operator shall use the signal authorized by Section 545.106 to indicate an intention to turn, change lanes, or start from a parked position.
(b) An operator intending to turn a vehicle right or left shall signal continuously for not less than the last 100 feet of movement of the vehicle before the turn.
(c) An operator may not light the signals on only one side of the vehicle on a parked or disabled vehicle or use the signals as a courtesy or "do pass" signal to the operator of another vehicle approaching from the rear.
Because this is a Class C Misdemeanor and criminal offense in Texas, you must go and fight the charge. Of course hiring a seasoned traffic attorney is always recommended. However, if you are unable to do so, you must go forward pro se. Since it is a criminal offense, the officer or prosecution will need to prove their case beyond a reasonable down. The officer will probably testify that he saw you commit the violation himself and that your actions were dangerous to other drivers. You may be able to beat the charge by putting on evidence that your actions were safe and did not cause injury or harm to others and there were no accidents. You may be able to present evidence that you allowed enough space when you changed lanes and that the other drivers did not have to step on their brakes and come to a screeching halt. Maybe the officer's vantage point was not good and he had a poor view. Any of these defenses may help you get the case dismissed against you. A conviction carries up to a $500 fine. I hope this helps.
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