EDDM has several steps

1. Choosing how many you would like to send out.
2. Print the item you would like to mail.
3. Selecting the locations you would like the to go.

https://eddm.usps.com/eddm/select-routes.htm

1. Bundling and dropping them off at the post office to be delivered
2. (Optional) Sending you any non-mailed postcards to hand out ie: 875 were mailed but we printed 1000. 125 are left over for you to hand out.

We have made this extremely simple for you to use this amazing service.