View/Modify Inserts
The Inserts Review screen is where you build your mailing. This is where you can upload additional documents, envelopes, add a logo, etc.
To quickly get to this screen for a job that's already been created, login to your LetterStream account and click on My Jobs in the top navigation bar to ensure you are on the screen that lists all of your jobs.
Locate the mailing in question and click EDIT to the right. Then, click the option that says View/Modify Inserts.
If a job has already been approved this option will simply say View Inserts (as you will not be able to modify the job at that point).
Note: You can also access this Inserts Review screen by clicking on the job name, and then clicking on the button that says Review Inserts.