First, open your wall art project in the Pixum Photo World software. In the left navigation bar, switch to the tab "Picture hangers". Here you will see all the wall brackets that you can choose from. The selection varies depending on the product & size selected. In this case, for example, only the screw and the clamping systems are available, because the rail system and the mirror plates cannot be combined with the gallery print because of its solid weight.
Click on the desired wall mount and drag it over the photo whilst holding down the left mouse button, right onto the editor area. The selected bracket is now displayed below your Wall Art, and in the editor window you will see the corresponding placeholders for the visible parts of the bracket in front of visible wall brackets (e.g. the screw system).