Hi,
You can change the port that Ace-Pi listens on by running this in your terminal connected to the device:
sudo sed "s/listen 8081/listen <PORT>/" -i /home/pi/Ace/nginx/conf/nginx.conf
For example, to set the port to 443:
sudo sed "s/listen 8081/listen 443/" -i /home/pi/Ace/nginx/conf/nginx.conf
You'll need to restart Ace-Pi with:
Hope that helps.
Cheers,
Chris