That is a Text-Image (graphic), and it is URL is this:
flexiblewebdesign.com/virtuemart-2-template-puremart/templates/beez_20/html/com_virtuemart/assets/images/Flexible/productdetails.png
in our DEMO.
And in your website it has this URL:
ROOT/templates/beez_20/html/com_virtuemart/assets/images/Flexible/productdetails.png
this the PNG version, which means, you can't make the edits easily, but if you browse this URL:
flexiblewebdesign.com/virtuemart-2-template-puremart/templates/beez_20/html/com_virtuemart/assets/images/Flexible/productdetails.psd
It is the Photoshop Document Source File (PSD) of that PNG, it is also exist in your server in here:
ROOT/templates/beez_20/html/com_virtuemart/assets/images/Flexible/productdetails.psd
So basically, open this PSD with any version of Adobe Photoshop, easily change the text and save it as productdetails.png in the same location (don't change its name but overwrite with the existing). Then you will be all set.
All the other TEXT-Images (PNGs) come with the PSD source files, (with the same file name, and in the same folders, just their formats are PSD instead of PNG). You can change any text you would like by modifying those PSD through Adobe Photoshop. (i don't know if any other software is capable to open PSD file rather than Adobe Photoshop though)..
BUT BE AWARE, don't change the image's height and width values but only edit the text in it. IF you plan to type some long text which doesn't fit there, try to use a different font or decrease the font size, don't touch the image width and height values, otherwise you might end up with a layout problems.
Regards.
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