[Plugin: MapifyPro] Setting default filter on page

I was busy with this plugin and wanted to set a default filter.

I’ve read their support page about this:
https://scissorbox.zendesk.com/hc/en-us/articles/202165196-Can-I-filter-out-results-on-the-Map-By-default-

and was wondering if somebody knew where i should add this javascript to make the default filter work.

Thank you