This site's form has failed before, so know the alternatives. The page itself gives (855) 326-2681 and says a request can be completed on that call.
In writing, requests go to support@privatereports.com. That looks like the wrong company until you know that Infomatics LLC files three domains together and nominated one address for all of them. Say that your request concerns publicsearcher.com, give the date you used the form, and ask for deletion. Requests about privaterecords.net belong to Private Records LLC, a separate business despite the similar name.
California residents have a third route. Infomatics LLC is a registered broker, so a request through the state's DROP platform reaches it without touching this site.