Hello,
Greetings from Mplussoft
We can do all the below aspects but would need more information on it so we can help you better.
1. I need to add a subscriber by using the IP address of the subscriber so that once anyone is within the range of the address, they do not need to log in
2. I need to change the template so it is user friendly
3. I believe there is some vulnerability on the site which I will like to be rectified
Kindly initiate project communication so we can discuss further.
Regards,
Mplussoft