Can I sign up for PSM now but begin using it at a later date?

When you sign up with PostScan Mail, you are given the option to submit a change of address to the US Postal Service. This will allow you to automatically receive mail at your selected location either right away or beginning on a specific date.However, your subscription begins on the day that you sign up for your PostScan Mail account. Subsequent billing to renew your subscription will occur on the same day each month.