On the homepage there is a slider available where you have the possibility to show 1 or more banners, i.e. for promotional purposes. You can add and/or change these banners easily yourself.
Go to Content > Elements > Blocks
Search for the block with identifier "slider_homepage"
Click on the right side on Select > Edit
Scroll down to the input box and press Show/Hide Editor to show the "Microsoft Word"-style
Click your cursor next to the banner you see and press Enter, so a new bullet appears.
In the toolbox in the top you can Insert an image --> a popup appears
In this popup you have the possibility to select an existing image, or to upload a new one
Select the image you want and press "Add Selected" in the upper right corner
The popup closes and now you can press OK, your new image is now shown in the editor and is selected
While your image is selected, press the "Link" icon in the toolbox to determine what needs to happen when you click on the new banner
To determine the right URL, you can better go to the page you want to link through the website itself. Whenever you have the right page, copy the link from the browser and paste it in the text field.
Press Save
Check if everything is alright on the homepage.