Please create web server writable folder config in phpMyAdmin top level directory as described in documentation. Otherwise you will be only able to download or display it.
Force SSL connection
This option should be enabled if your web server supports it.
Allow login to any MySQL server
This option should be disabled as it allows attackers to bruteforce login to any MySQL server. If you feel this is necessary, use trusted proxies list. However, IP-based protection may not be reliable if your IP belongs to an ISP where thousands of users, including you, are connected to.