mStream wrong address stuck

[beasta0160]

I wanted to host my music collection on a private server to use on my iPhone when I’m out travelling. After installing mStream app, I realised I can’t port forward on ipv4 due to ISP restrictions. I tried playing around with ipv6 and that’s when I changed the “Address” in mStream settings to my ipv6 prefix by mistake and 12001 port. Since then, I have been getting EADDRNOTAVAIL error and I am unable to log into mStream through Chrome to undo this change.
I tried task killing this port but it keeps saying “cannot open 12001”.

I tried uninstalling and reinstalling mStream and this error still persists. I’m basically locked out of mStream because of this error.