I am not sure if you noticed, but in the libraries, you will find several models, descriptions and styles of receptacles, switches, etc. But, if you wish to add your personal description, use the Leader dimension tool (arrow) => point the component => edit the text and / or change the font. See attached.
In addition, to change the color of the the arrow and the description, you can move them to another tab (Detail, Decks, etc).
Hope this helps.