import time
from selenium import webdriver
username = "myusername"
password = "mypassword"
dropnumber = "11111"
picknumber = "22222"
driver = webdriver.PhantomJS()
try:
 driver.implicitly_wait(5)
 driver.set_window_size(1024, 768) # optional
 driver.get("link")
 driver.switch_to.frame(driver.find_element_by_tag_name("frame"))

 #login page
 driver.find_element_by_css_selector("#username").send_keys(username)
 driver.find_element_by_css_selector("#password").send_keys(password)
 driver.find_element_by_css_selector("input[type=submit]").click()

 #after login
 driver.get("another link")
 driver.find_element_by_css_selector('option[value="'+dropnumber+'"]').click()
 driver.find_element_by_css_selector("#DERIVED_REGFRM1_CLASS_NBR").send_keys(picknumber)
 driver.find_element_by_css_selector("#DERIVED_REGFRM1_SSR_PB_ADDTOLIST2\$106\$").click()
 driver.find_element_by_css_selector("#DERIVED_CLS_DTL_NEXT_PB").click()
 driver.find_element_by_css_selector("#DERIVED_REGFRM1_SSR_PB_SUBMIT").click()
 time.sleep(4)
 driver.save_screenshot('screen.png')
 driver.quit()
except:
    driver.quit()