To add special characters to text:
Highlight the text where you want to use a special character by clicking it twice.
Make sure you place your cursor where you want to insert the special character, or highlight just the letters you want to replace.
Choose Edit > Special Characters to open the Character Palette.
In the Character Palette, select the character you want to add by clicking it once.
Click the Insert button in the lower-right corner of the Character Palette.