The default address (62, West Wallaby Street, Wigan, Lancashire, XXNN NNXX, United Kingdom, which is the address of a famous British inventor) can be changed by going to Administrator > Jomres > Settings > Site Configuration and using the "Your company details" tab.

The Organisation Logo input in that tab is only for the Google structured data, it's not used anywhere else in Jomres.

If nobody clicks that link and gets the joke, I'm going to cry