Problem with styling paragraph

Hi, i'm now playing well with BSS, but i've a question : When i'm using the paragraph component, there are some bold italic, etc button on top. But they're not working. the text does'nt change when i'm clicking on it.

So, for now, i'm using bold component or span, but the way they works is really far longer ! Just selecting text, clicking the B would be really faster !

You need to make sure that the text (not just the element) is highlighted that you want to be changed. Also, check to be sure you don't have any other classes that may be overriding the changes you're making manually.