To use the Bold, Italic, and Underline commands, follow these steps:

1. Select the cell(s) you want to change.
   
   
   
2. Go to the Home tab.
   
   
   
3. Click Bold (B), Italic (I), or Underline (U).
   
   
   

For example, if you click Bold, the selected cells will become bold.

You can also use shortcuts:

• Press Ctrl+B to make text bold.
• Press Ctrl+I to add italics.
• Press Ctrl+U to underline text.

This will apply the style to the selected text or cell.