Go to your organisation page (log in > press the profile icon at the top right > select your organisation in the unfolded menu)

Press the settings tab on the left

Here you can set a new logo and cover picture

If there is already a picture, you can replace it. Move your mouse over the photo (like here over the logo) and press the trash bin.

Does your organisation not have an image bank where you can find a good cover photo? Then take a look at this site, or this one, or this one for nice rights-free photos.

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