I don't have any idea how to set up this script if I have the script maybe I could help but since you bought this why not ask the seller how to set up it.
According to your image, it seems it was developed by Eckmar, and the script called "Eckmar's Marketplace Script" am I right?
And the image shows some samples it seems that the host, port and username, and password must be your nodes IP where your wallet is installed and must be fully synced(Like the above said if it was in the same server then use the local IP).
The full guide was pasted from here
https://pastebin.pl/view/422aae0dWhy not ask Eckmar for help to set up this he is still active here on the forum and bring this on their official thread here
https://bitcointalk.org/index.php?topic=5124640.0