Hi@ijen
Secure shell is fairly easy to work with, even though it does not look user friendly at all. You just need to launch the Terminal tool in macOS, then type “ssh admin@” (without quotes) followed without spaces by the IP address of the device you want to connect to (you can find the IP address of your QNAP by looking in your router’s settings page for connected client devices, or, presumably, by looking at your QNAP configuration page).
Once connected, just copy and paste the commands that QNAP gave you into the window, and type “exit” when done to disconnect.
I just now found the step-by-step instructions on the web, but they are split between multiple pages and not the clearest I’ve ever seen. I’ll compile them into one set of steps for you below:
SSH access the NAS in macOS
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Open Finder.
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In the menu bar, click Go and select Utility
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Open the Terminal app.
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In Terminal, use the command ssh admin@YOUR_NAS_IP_ADDRESS (for example: admin@10.32.72.68) Note: If this is the first time you’ve accessed your NAS with SSH you will receive an authenticity warning. Enter yes.

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Enter the admin password. Note: Your input will not be displayed on the screen.

Change SMB options
Copy each of the 3 lines below and paste into the window one at a time, pressing Enter/Return on the keyboard after each line:
setcfg -e Samba 'Min Protocol'
setcfg -e global 'min protocol' -f
/etc/config/smb.conf /etc/init.d/smb.sh restart
Exit
Type “exit” followed by Enter/Return to exit SSH, and repeat to exit Terminal.
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein