Une Boutique comes with a whole bunch of customization options, which you can find it under Appearance → Theme Options. You can use these options to customize the layout of shop, blog and forum pages, change the background color, choose color schemes, change header styles, adding your logo, favicon and many many more options.
You can start adding your own options, and you can also import the demo theme options.
To import theme options, on the files you have downloaded from themeforest, open up essential-imports folder, then open up theme-options.txt file and copy all the code inside it.
Now, on your wordpress admin browse for OptionTree → Import scroll down to the field labled Theme Options and paste the code you just copied here. Hit Import Theme Options.