Splinter works well for this kind of thing:
https://github.com/cobrateam/splinter
You could do something like:
from splinter import Browser
with Browser('firefox') as browser:
browser.visit('http://yourwebsite.com')
browser.find_by_name('element_name').click()
do some other stuff...
You just need to find the name or ID of the element you want to interact with on the page