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Constant EditorΒΆ
The Constant Editor can be found in the module "Web > Template".

Web > Template
Select the page in the page tree which contains the root template of your website. This is mostly the root page of your website as well.

The Root Page in the page tree
Select "Constant Editor" in the dropdown at the top of the "Web > Template" module. This should show the root template of your website if it is available below the sentence "Edit constants for template".

The dropdown in the template module
In the dropdown list "Category" select the category "Content".

The category dropdown in the template module
This will give you a list with all the constants of this extension. All constants are described and can be edited by clicking the pencil in front of the current value or by editing the available field.
Don't forget to save the new values afterwards by using the appropriate button at the top of the module. The new values will be stored in the "Constants" field of the root template of your website.