Make sure that aria2c is running and rpc is enabled. aria2c --enable-rpc
Enter the ip or dns name of the server on which the rpc for aria2 is running (default = localhost)
Enter the port of the server on which the rpc for aria2 is running (default = 6800)
Enter the username of the server on which the rpc for aria2 is running (empty if authentication not enabled)
Enter the password of the server on which the rpc for aria2 is running (empty if authentication not enabled)