Changing Oxford College after submitting UCAS

I sent my UCAS application into Oxford last Thursday but have now realised that I put the wrong college down and would like to change it. Tried the substitution choice on the UCAS app but it won’t work with changing the Oxford college. Anyone know how I could do this or if it is even possible ?

What are you applying for? Suggest writing to the admissions coordinator at the relevant department.

Thanks for the response! Mathematics, put my college as Somerville but would like to change it to Lincoln. Could u direct me to the the contact for the admissions coordinator as I have been looking for a email or number but can’t seem to find one