Installing XFCE (Pro) remix of Debian with UserLAnd's Bash & RealVNC

I decided today, finally, to give Debian a go on my Samsung Galaxy Tab S9 Ultra.

I have successfully installed the Debian remix and enabled permissions. I rather cavalierly selected the option to use the commandline rather than the visual option. It seems you cannot undo that preference once you have chosen it. So, I have committed to the inbuilt Bash Terminal in UserLAnd to get the job done. The documentation for this process is not up to date at GitHub and I couldn't find anything that specifically addressed my needs on YouTube.

Firstly, I ran:

sudo apt-get update && sudo apt-get upgrade

and it installed over 130 packages. Then, I ran:

export DISPLAY=:0 PULSE_SERVER=tcp:127.0.0.1:5900

I pressed enter twice and the UserLAnd Terminal didn't say or appear to do anything after I ran the instruction as the prompt shows no change and just returned to normal. So, as it appeared to accept the command without complaint, I felt there may have been a modicum of success. I had already registered an account with RealVNC and successfully logged on. I pressed the button at the lower right hand corner of the screen in RealVNC and it required two fields to be populated: [IP] Address & Name. In my Zsh Terminal in Termux, I then ran:

ifconfig

In the report in Termux, there are three different discrete number strings each embedded or nested in the report after the head code, wlan0. To me, they could all be IP addresses, as I am a bit of a noob.

I first tried the last string of the three in the field IP Address which was after the word 'broadcast', and entered it in the field and I just entered my first name in the Name field and it populated RealVNC with a box. I clicked on the box and it said:

The computer's IP address could not he contacted.

I tried to delete the box and try again but there appears to be no way to delete it. So, I tried for a second time. This time, I entered the first number string out of the three in the Address field, which was located immediately after the term 'inet' and populated my first name in the Name field again. It yielded a second box in RealVNC. When I click on this box it says:

The port on which the computer is listening for a connection could not be contacted.

I am stumped now and could really do with help.

Cheers