In RobotFramework How to edit h1 tags on w3schools site "https://www.w3schools.com/html/tryit.asp?filename=tryhtml_default

I have to fix an issue How can we edit left frame in the website - https://www.w3schools.com/html/tryit.asp?filename=tryhtml_default using robot frame work, I am able to click element by below xpath and its working, but unable to remove/add new text on h1 tag

Click Element xPath=//*[@id="textareawrapper"]/div/div[6]/div[1]/div/div/div/div[5]/pre[8]/span/span[4]

Please help in editing the h1 tag @ above site using robot framework