The ads.txt records which you need to include in your ads.txt file will be provided to you by the ad networks which you are using - they are usually provided via your ad network control panel, or via email by your ad network account manager.

If you need help finding your ads.txt records please contact your ad network whom will be happy to assist. If they are already using ads.txt Guru then they can provide you with their collaborator tag to allow them to collaborate with your ads.txt file, or alternatively you may wish to recommend ads.txt Guru to them to encourage them to collaborate.