To change a companies bank details or company logo (image), this is done within the Administration module (not the application).
Step-by-step guide
Navigate to the admin module, then head to entity → entity.
Select the entity role Region/Devision entity (rDiv Entity)
Edit the required rDiv, and you will be presented with the following screen.
Add in the changed bank details as required in this section as noted in the image above.
To change an image, stay in the same dialog box and head to the image tab, then clear the current image, and then select the new one.
Clicking on 'select image' will bring up another dialog box for you to search your computer for the image file you wish to use as the new company logo.
After making these changes, press OK to apply them to that rDiv.