Automate creation of accounts using powershell from a webbase tool

I'm looking for a way on how I can automate creation of accounts for our users. it is one of the daily task that I do and I wanted to make it more efficient by doing an automation. I already got an automation for the AD and Exchange part done but can't figure it how I can do this for a web base application. Here's an example. I go to https://internalip/ enter my username and password, click login. After logging in, I would click on user management tab then create an account. Is there a way for me to automate this work via powershell? Any tutorials or ideas is much appreciated.

Thanks,

Neo