How to enable chat agent and configure them and how to add chat agent skill in Salesforce?

Hi,

Enable Chat Agent and Communities
1.Click the setup cog and select Service Setup.
2.Enter Communities in Quick Find, then select Communities Settings.
3.Select Enable Communities.
4.Enter a unique value to be used as your domain name and click Check Availability. Note: Keep in mind that you can't change the domain name after you save it. ...
5.Click Save.
6.Click OK.

Create a Chat Agent Skill
1.Enter Skills in Quick Find, then select Skills.
2.Click New.
3.In the Basic Information section, enter these details.. Name: Web Support. Developer Name: Web_Support.
4.In the Assign Profiles section, add Custom: Support Profile, Standard User, and System Administrator.
5.Click Save.

Thanks.