As most everyone here, i've been working with code for more than 20 years. the ability to edit source is fundamental to everyone.

i've used the senswhite template and about a section i've added some divs in the index.htm and in the index.css i've added some formatting. the result is that the page is just how i'd like it... now when i go and open the project in OE, the changes i've made are discarded. 

i have to be missing something in the product to allow me to edit source. can anyone help? 

in the senswhite template between pan_central_a_propos and pan_texte_a_propos_2 i've added a couple of DIVs (end of this post) which put a nice header of text between the elements. I've added a "100%" width formatting element in the index.css. these are the easiest, simplest most non-destructive HTML things i could imagine. but OE will not accept these changes to the original files, and there's no where in OE that i can find that would allow me to A) add anything or B) precisely add anything. furthermore, there's no way via the OE UI that I can find to make my necessary changes. this is the simplest thing i could imagine as a use case scenario for a web developer. surely there's something that is hidden that makes this easy. 

DIVs