Moneydance's address book allows you to include information such as street addresses, phone numbers and email contacts for people and businesses.
To add, delete, or edit addresses navigate to Tools > Address Book.
Select "Add" to create a new Address Book entry.
You can input a name, address, email address and phone number. 
When entering a transaction you can select any entry from your Address Book within the Description field. Entries that point to address book information display a green @ symbol.
Once you've added the transaction to your account with an address book entry assigned, you'll see a blue @ symbol within the description field.
Address Book entries must be used to print addresses on checks. This is detailed further in this article.