[Theme: Graphene] how do you create two columns in the edit page

Two columns in the edit page can be activated via screen options:
http://blog.kjodle.net/2012/06/04/use-wordpress-screen-options-to-expand-your-blogging-options/

Yes, if you are using the html editor.

Add this code where you would like your columns to begin:

<div style="
   -moz-column-count: 2; -moz-column-gap: 20px;
   -webkit-column-count: 2; -webkit-column-gap: 20px;
   column-count: 2; column-gap: 20px;">

and </div> where you want the columns to end.

You can change the number of columns to whatever you like, as well as the column gap.

very technical for me

Then you are probably better off using the Visual Editor to enter and format your content, and then using the HTML editor last to add that code.

So you put the code in front of the text and at the end of the text?

Yup. If you forget to include the closing div (</div>), it may mess up the rest of your page.

So you can’t do it visual?

You can try my friend Josh’s Ultimate TinyMCE Plugin, which will allow you to create columns by inserting a shortcode:
http://wordpress.org/extend/plugins/ultimate-tinymce/