The answer to 'how to fix plumbing repair' is to first identify the specific plumbing issue, then follow the appropriate steps to address it. This may involve tightening connections, replacing washers or gaskets, or unclogging drains. Safety is paramount, so be sure to turn off water supply and wear protective equipment as needed.
For more complex plumbing problems, it's often best to call a professional plumber. They have the expertise and tools to diagnose and resolve issues properly, and can ensure the work is done safely and up to code.