Request a Full Site if it is a mobile friendly site
Scroll allll the way down to USPS JOBS
It would be in your best interest to read the pdf files under Before you apply section.
Create an account or Just Browse
It's best to create an account incase you find something your interested in.
Apply to a job
After you have applied. You will either be selected or not. Your email will be primarily used for contacting you. The same email that you applied with. The same. Exact email. Make sure your email is correct and checked often. You don't want to miss your chance. THIS process can be a long wait.
Have you been Selected?
No - See above and Reapply
Yes - Now the fun begins.