To be sure … you want to know how to add pictures of your own coin to the page that is currently missing the main example pictures?
If yes, on the catalog page click on the little pen icon on the upper right or the link Modify or add data on this page at the bottom.
Then upload your files of the obverse, reverse and edge with clicking on the button (probably not in German on your browser).

Select the first option on the drop.down menu for ‘Source of the picture’.