Google is testing a way to let users make changes to their own Knowledge Graphics cards that are shown in the search results. Until now, Google had published three support pages with the information on how does customizing profile cards works which has been takedown. Here is some of the information from those google support pages.
Creating a profile card is as easy as searching ‘add me to Google’ and then clicking on the link to ‘Get started.’ Users will have to give information like their location, name, and occupation. Google offers users to make use of keywords in their profile cards, specifically when you are sharing your name with another well-known person.
Users have to follow certain guidelines while using keywords in their profile cards. For example, Matt Southern SEO would work fine but something like Matt Southern the best SEO in Canada might get rejected.
Once you have created your profile card it will be shown to the people when they search for your name. These cards are not guaranteed to show up every time but more the information you provide the more likely it is that Google will showcase your profile card. As of now, this feature is only available in India and it is expected that it will be available for all the users worldwide soon.