Downgrade from Premium live to premium

I have read that you go to the left and chose switch products and chose downgrade.  The only option is upgrade.  I have filled out all my forms myself, have not used the live help chat button at the bottom right to avoid paying more, as I had previously read you can change it later.  However don't see where to do that.  

 

TT, Please advise how to change to premium only.  I never used the live option chat and therefore definitely do not want to pay for it.  Thank you!