I tried this with my last steem post(via web) and it worked perfectly fine for me.
I was surprised to see some cool features on Post Option, but not sure whether they work or not so I made a post by disabling the curation rewards and steem/sbd slider to too low just to check these functions. Do they work?

Some feature suggestions.

• Please add the ability to save multiple no. of drafts, I really want to see this feature on steemit itself because there's no way to recover previous drafts when overridden by the newer one.

• Please add an option to clear or delete saved drafts too.

• It's irritating not to find a proper way to close or minimize these pop-ups.One should have disappeared automatically when I click on other info.It really took me sometime until I realize how it works.
  

I tried with only post and I am still now familiar with all the possible options here.I want to check that signature feature in my next post and will update about it.

Thanks.

System useed: Windows 8.1, Google Chrome Browser