Click "Contacts" and select "Vendor List."
You can select the contacts you'd like to create a mailing label or envelope for by checking the box next to their name. You can also use the filters to pull up a specific group of people.
Once you've made your selection, click the blue Print Icon on the right.

You can then choose to make Envelopes, Mailing Labels, or print your Vendor List.
Make your selections and choose "Download File" and that's it!