Text deletes after being clicked. How do I make it not do this?

Everytime I type something in a textbox and then click it deletes the previous text that was left instead of making it so I could edit it. Is there a property that I didn't find in there?

https://imgflip.com/gif/3x551t -- Heres a gif of me trying to do it. I know bad quality and watermarks but I'm sure you can get the point.