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Holds are specific to individual departments. You would need to look at your hold to see which department put on the hold. The department that put on the hold is also the department that would need to remove the hold.
If you are unsure which department your hold belongs to, please feel free to reach out to the graduate college at gradcoll@uco.edu and we can connect you to the right department.
Most holds would need to be removed before you are eligible to enroll in courses.