Hi, I don’t know if this has been asked before (it probably has), but after logging into My UH Self Serve, I can’t find anything that lets me decline admission.
Call the school or send an E-Mail to ask how.
This happened with one of my schools last year as well, they didn’t have anything on the portal to decline admission. When the time came, I just sent admissions an email saying that I had decided to go elsewhere. Probably the best course of action in your case as well.