do not optimize/remove html I would like to have a page with some html content in it that CK Editor does not seem to support, in particular: I want to have a little &lt;form tag with a couple of &lt;input fields. I can enter it in Switch to plain text editor mode and save from there and it will keep the elements but when I want to edit the page, it'll go back to the Switch to rich text editor and remove my &lt;form html items. How can i set CD Editor to not remove any html it may not be able to render? 
Thank you!
Depending on which one you are using (filter or full html) You need to go to 

/admin/config/content/formats/filtered_html

OR 

/admin/config/content/formats/full_html



Then under Limit Allowed html Tags add &lt;form&gt; &lt;input&gt; into the list. 

If that does not do it, try unchecking the correct faulty and chopped off html box.

Edit:

If you want to switch between text formats and not have your code erased go to: 

/admin/config/content/ckeditor/edit/Advanced (for Filter HTML)

/admin/config/content/ckeditor/edit/Full (for Full HTML)

Then under Advanced Content Filter, select disabled.