Welcome to the forum.

Those instructions are for writing a disc not reading a disc.

There is no .iso file on the disc, the iso file is the disc, compressed into a single file that is then saved on to your hard disc.

You then use this compressed file to create new discs.

So procedure to read, (i'll asume you have imgburn installed)

run imgburn,

Set mode "read" (third tab, along top)
Click on the destination (browse for a file icon)
Type in a name (in any dir that you want)
Put cd/dvd in drive
Press bottom icon (that looks like a cd-> cd on paper)
That will read a dvd and write it to a iso image (on you pc)
Eject dvd.
Close imgburn

So procedure to write,

Open imgburn

Set Menú Mode - ISO - Write
In "Source - select a file..." - click on the icon with the yellow folder
Select "C:\filename.ISO" - Open
In "Destination" it will show the model of DVD recorder, if you have various select where you want to record.
In "Settings - Write Speed", select "1x" (i go no higher than 4x speed)
Put a blank DVD into DVD recorder and "imgburn" will activate the gray button bottom-left to record it

Hope this helps

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.