I don`t know much about the U.S prison system. I want to visit someone at cummins unit in Grady AR. Do I need any permissions or something like that?

You will need to write the person that you want to visit and have them put your name on their visitation list. They will need basic information like your name and DOB. When it is approved, they will have to contact you and tell you when they can have visits.

Yeah, ask whoever you're planning on seeing to send you a visitation form to fill out and send back.

What means DOB?

DOB = date of birth.
Contact the prison and they willl telll you what you neeed to know.
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- Bob.