To cure your ballot means to fix an error so that it can be officially counted.
If you voted provisionally because you did not have an appropriate ID or supporting document, or if there were issues with the signature or identification numbers on your mail ballot, then you must cure your ballot within six days of the election. This means you must bring your ID to Harris County Clerk's Office Elections Department, 15600 Morales Road, Houston, TX 77032 to verify your identity.