user1="myusername"
password1="password"
url="https://reg.usps.com/login?app=MyUSPS"
browser.get(url)

username = browser.find_element_by_name('username')
username.send_keys(user1)
sleep(5)
password = browser.find_element_by_name('password')
password.send_keys(passwd1)
sleep(5)
browser.find_element_by_id('btn-submit').click()
sleep(3)