craigslist renewing posts -- triggering HTML forms

searching for

craigslist

on the

general help and support

forum and looking at some of the existing posts, I can figure out how to get to the HTML on my CL account page. Once I find a listing that has an option to

renew

it, how is that renew action triggered programmaticallly?

here's the item that needs to be renwed, with the values obfuscated.

<td><form action="[url="https://post.craigslist.org/manage/nnn"]https://post.craigslist.org/manage/nnn"[/url] method="POST"><input type="hidden" name="U2FsdGVkX18yODc5O:TI4Nw.oKrVIl0UARegrhuSj8zLZUCoKaeo3nnn" value="renew"><input type="hidden" name="U2Fs.dGVkX18yODc5OTI4N0BY:4eHT9YG4DOZqERyFo7RVws8QosOnnn" value="U2FsdGVkX18yODc5OTI4N0fP6qcCPRX5I8nR1wAXxFjvd2EI24bnnn"><input type="submit" name="go" value="renew" class="managebtn"></form></td>

there's got to be a simple way for a function call to trigger a form action just like a mouse click on the page, but I can't wrap my head around where to go or what to look for in the language guide. I can't tell if I'm doing this the simple way or the hard way, and I don't know how close I am to the finish line. I just don't know.

so, any help? I don't need hand holding, but pointers to other code or clues on what calls to look as I investigate would be great.

i've always made the most progress looking at others' existing code.

thanks