1. Login to your Website Dashboard

2. In the dashboard menu, hover you mouse over PressApps and click Knoledge Base, then click the Voting Tab.
Voting-tab

3. To Enable the Voting, select Public Voting or Logged In Users Only.
Enable-voting

 

Additional Options
Voting-options

4. Once all the settings are done, click the Save Changes button at the upper right corner of the page.
Save-button

in Knowledge Base