To change the copyright at the footer of the webshop you can follow these steps:

1) Click on 'Content' and then on 'Configuration' (under the 'Design' section).

2) Choose the storeview you want to adjust and then click on 'Edit'.

3) Scroll to 'Other Settings' and click on 'Footer' (the third section).
Afterwards go to the 'Copyright' section and fill this in.

Note: remember to click on 'Save Configuration' (on the top right) when you're done with making these changes in that storeview.