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Xiaobai Wang 4Xiaobai Wang 4 

I am unable to enable knowledge settings at "Enable and Configure Lightning Knowledge" step in project "Build a Community with Knowledge and Chat".

SandhyaSandhya (Salesforce Developers) 
Hi,

Make sure that you have followed below steps before enabling.

To access Knowledge, you need permissions on your user record.
From Setup, enter Users in Quick Find and select Users.
Click Edit next to your name.
Select Knowledge User.
Click Save.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya