Hello @Koen,
You don’t have to change anything in this code snippet, just paste it into the custom code area Before </body> tag. Dont forget to wrap it with <script></script> tags.
Next step is set correct links to your tabs. For that you will need to add CLASS NAMES to the tab-links. It can be combo classes. I usually give the specific class names, which “sound” the same as tabnames. So “tab-kantoor”, “tab-flexplek” and “tab-vergadering” should become also combo classes for TAB-LINKS.
Then links to particular tab will look like this: /page_name?tab=tab_class
In your case it would be: /flexwerkplek?tab=tab-kantoor
Hope it helps,
Anna