In my modem settings I use no-ip because I have a dynamic IP address. If I want to use IP Access Restriction Management in Plesk do I have to configure anything or is adding only my ip address sufficient?
If you are using a dynamic IP address, it is a bad idea to restrict access to Plesk to a specific address or a range. Once your provider assigns an address that is not within the defined range, you won't be able to log in to Plesk any longer.