A direct connection means that you used your device to search for nearby WiFi networks and you are connected to GHL DOSER-2. You then navigate to the app and enter 10.10.100.254 into the HOST box. <---That is a direct connection.
This topic is covered in the manual. :)
Based on what you have entered in the app, you are telling the app that the doser's IP address is 192.168.1.2. This would assume that you've already connected the doser to your home WiFi. If that's the case, 192.168.1.2 is likely not the correct IP address. If you set it up with a Static IP address, enter the IP address YOU assigned during WiFi setup into the app's HOST box. If you set it up with Auto IP, you will need to log into your router and see what IP address was assigned to the doser by your network.
If you did not connect the doser to your home WiFi, follow the direct connection steps to connect directly to the doser's WiFi signal. If you want to connect the doser to your home WiFi, you can see how to do that here: