How to make my router admin panel be accessible only by HTTPS without errors?

I need to make my router Admin panel be accessible not by HTTPS and block HTTP.

I am using Mudi v2

Chat gpt prompted to generate custom CA:

#!/bin/sh
openssl genrsa -out ca.key 4096
openssl req -new -x509 -days 36500 -key ca.key -out ca.crt -subj "/C=XX/ST=XX/L=XX/O=Example/OU=CA/CN=ca.example.lan"
openssl genrsa -out router.lan.key 4096
openssl req -new -key router.lan.key -out router.lan.csr -subj "/C=XX/ST=XX/L=XX/O=Example/OU=Devices/CN=router.lan"
openssl x509 -req -days 36500 -in router.lan.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out router.lan.crt
echo "CA and signed router.lan certificate generated in current directory"

It will generate certificates and key. What to do next?