Export and edit theme in Themer topic

Hi there, let's say I like one theme and I download it.

Now I want to edit few things in downloaded theme (font color, size etc). I used export option in developer options, phone confirmed theme is exported but I can't find it in mine sdCard in path:
This PC\Desire HD\SD card\MyColorScreen\Themer\Exported\zip

Why is it not there?
+ when you are finished with edits, how do you import theme back to Themer?