I've read the Wiki about it, and I know how to use GetAsync, but I'm curious on how to input information on websites. Could somebody explain it differently than the Wiki does?
3rd parameter of PostAsync is this. You'll need it.
First parameter is the URL you are posting to.
Second is a string (preferably JSON encoded table) that will be sent of to the website.
You have to figure out how the website handles the data.