Can't change sddm login

I want to personalize a bit bazzite OS (trying to not break anything) but the system just says "NUH UH" to me when i try to install another sddm login theme. I will post some images that shows my problem.
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Solution
Found another option. this one works just tested it... but be very careful if you edit your fstab file
https://discussion.fedoraproject.org/t/another-way-to-customize-sddm-under-kinoite/37773
Fedora Discussion
Because the config file of sddm is under /usr/share it is not possible to install sddm themes and change background pictures as normal. @nullrequest has thought of making sddm themes a rpm package and use rpm-ostree to install it. see hear However, she only provides source code but not binary program which makes it really inconvenient to use. ...
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