Click on the symbols button twice in the object type palette and then click on the Miscellaneous symbols button in the symbols palette. Choose the chord symbol (at the bottom left of the palette). Select the pencil tool in the toolbar and enter the chord symbol by clicking the mouse where you want the symbol to appear.
When you enter a chord symbol, the Chord Name dialog appears for you to build the chord you want.
Select the root of the chord in the box at the left of the dialog. The root can have a sharp, a flat or neither after it, depending on whether you select n, # or b beside the name for the root note.
If your bass note isn't the root, you can indicate this. Check the Bass box and then choose the note you want for the bass. The bass can have a sharp, a flat or neither after it, depending on whether you select n, # or b beside the name for the bass note.
Type in the type of chord you want in the Type box. If you want to type in a flat symbol, type B. If you want to type in a sharp symbol, type #.
The Preview box will show you what your chord will look like. Note that numbers and accidentals appear in superscript.