URL- how do you know what your URL address is?

To get your own URL you would need to get a website of your own, wordpress has free ones, so does Google with limited space. If, that's what you're asking.

the postal address Block E Brunswick Square Union Street, Oldham, Oldham, United Kingdom, OL1 1DE

If the picture is visible on the web, right click on the picture and select properties. That will provide you the URL of the photo.

The URL shortner help you with your address because it keeps it small and appealing instead of all this letters and numbers You can try URL shortning for your self by looking to these siteslike...

Uniform Resource Locater