Look no further
This by default loads the new iframe with a blank Search Job Listings form. This iframe also should have ‘Search Listings’ | ‘Apply Online’ | ‘Register CV’ tabs in it.
When submitting the Search form, the iframe should load the search results in this new iframe, eg
https://www.peopleandco.nz/apps/website.nsf/iFrameSearchResults?OpenForm&Keywords=&Location=&Category=&JobType=Permanent%20or%20Contract&Search=Simple.
So the page should then look like this.