Final answer:
To change the font and font size, highlight the desired text, use the toolbar to select a new font or font size, and click to apply the changes.
Step-by-step explanation:
To change the font and font size of selected text, you can typically use a word processor or text editor’s toolbar. First, highlight the text you want to change. Then, locate the toolbar at the top of the program, which should have options for font style and size.
To change the font, click on the current font name; this will usually bring down a menu with a list of available fonts. Select the one you prefer. Similarly, to change the font size, click on the current font size number, and a drop-down menu will appear with different size options. Click on the desired size to apply it to your selected text.