Step 1: Download Oracle Skin Editor (https://docs.oracle.com/middleware/1213/skineditor/index.html)
Step 2: Install & Run SkinEditor
(http://www.oracle.com/technetwork/developer-tools/adf/downloads/index.html) read this documentation carefully
Step 3: Create New Application
Select correct "Target Application Release"
Step 4: Create New Project & ADF Skin File
Select your base skin
Step 5: Edit ADF Skin
Step 6: Create Deployment Profile & Deploy as ADF Library
Manifest file should be:
Step 7: Deploy ADF Library to Weblogic
Skip that issue
Step 8: Restart Servers and Check your library settings.