Okay... if you have no AddOns button at the character selection screen, that means you have no addons installed... at all (other than the default Blizzard addons). That means that after you renamed your WTF and Interface folders, you did not install the new copy of nUI in the correct place.
The correct location would be in [ World of Warcraft > Interface > AddOns ] and after you have installed nUI, you should see the folder [ World of Warcraft > Interface > AddOns > nUI ] -- if you don't see that folder, you have not correctly installed the addon.
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