How to insert text inside a Div ?

Let's say I want to get this :

<div class="child-one">One</div>

I can't find a way to just enter the text : One in any window

Any help ? Thanks Fransua

Please watch and read the tutorials as you are asking basic questions about this app that are mostly covered in them.

Add a Custom Component to your page, double click it, and write your HTML there. Although that's a rather absurd way to add text to a program that give you pre-made <p> components.

BSS uses/provides components so you don't have to write HTML. You need to do as @Jo said, and read the tutorials and watch the videos. You lack a fundamental understanding of how this program works. You're trying to reinvent the wheel, and sidestep the time-saving features BSS exists to provide.