I last used Upwork when it was Elance and I found it very easy to use. I have a 'supplier' account but I no matter what I do, I can't go through the process of hiring. And it's hiring I want to do!
I'm getting so frustrated. I've tried everything I can think of and I just can't seem to find where to pitch my job so I can win some bids.
I can't even find a help section to show me what to do!
It looks like you do have a client-company on your Upwork account. In order to access it, please click on your picture in the upper right corner and then select your client-company in the drop down menu that you'll see. You'll be able to post jobs and search for freelancers there.
Check out this help article for more information.