iwishihad requested Ziggy to be more explanatory and here it is:

You will configure your BP supplied "Bridged" mode as a true router. (Should also work for the 530 single port device when used in ETHERNET mode!)

Make a folder like "510 ini files." Placed the "ini" files you have in this folder, thus:

Using a favourite browser type in "http://10.0.0.138 and this window will open:

Click on the "+" alongside Basic: