Not able to modify code

In my code to editer I am unable to delete text or add text. It shows the line marker, and nothing happens when I attempt to delete, or add text. I would appreciate help to work a way, so I may continue my education. Thank you for reading, and any input you may have.

What browser, what platform? Need a little bit more information here.

I am using a onn tablet with Android operating system, using chrome to view website.

I am using a onn tablet with Android operating system, using chrome to view website. The lesson is the HTML section with making an internal link. As for the link just need a minute to get it.

https://www.freecodecamp.org/learn/responsive-web-design/basic-html-and-html5/link-to-internal-sections-of-a-page-with-anchor-elements

Sorry I do not know how to do that on a tablet looks like I am going to have to use a laptop or computer.

it may also be that your keyboard is not adapted for the code editor