1. Email the details of your task to firstname.lastname@example.org
2. Use a descriptive subject line, for example: Facebook ads
3. On the body of the email describe everything that you need, include attachments, if necessary. For more information about what to include please refer to our best practices.
Usually it's as simple as:
Size and format
Color that you'd prefer to see
Inspiration or similar works
Will it be used in web or print?