If you need only to edit one or a few words,

- Highlight the required words to be changed

- Click on the AA icon (bottom row of toolbar, 6th icon). This is the font icon. A pop up window will appear. You can format most aspects here – colour, size, style; it also has many tabs at the top to choose from for editing background, block (paragraph), border, and many more. Any changes made in this pop up window will be applied to the selected text you highlighted previously.