On the VA website you will find a link to
File for disability compensation
This is where I submitted my original claim for Tinnitus. Once submitted, this will prompt what is called a Compensation and Pension exam or C&P exam. Once the C&P Exam is established it is the most important appointment to never miss, I can’t overstate this enough. DO NOT MISS your C&P exam. The C&P Exam that got me Service Connected was a hearing test. At the hearing test tell the administrator of the hearing test you have ringing in your ears, and, what you did in your military service for a job. I worked around steam turbines. If for example you worked around combat artillery that too will cause tinnitus.