this is how
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/Program files/Steam/Skins. then just add it there i dont think its like that i gonna type Program files but my computer is Danish that's why
GOOD LUCK HOPE IT WILL HELP ALL YOU GUYS

!!
1. Open up your 'Steam' folder (typically C:\Program Files\Valve\Steam)
2. If there isn't a folder called 'skins' make one
3. Copy the 'Flat - White & Cyan' folder to the 'skins' folder
4. In Steam go View > Settings and click on the Interface tab
5. In the 'Select the skin you want Steam to use' box change it to 'Flat - White Cyan'
6. Click OK
7. Click 'Restart Now'