Visual C# add item not showing in vs2017 ASP.NET web app

I was trying to add WCF templates in visual studio 2017 ive installed and followed everything in the thread link below so in my problem it might be the Visual C# add item not showing is the problem.

https://developercommunity.visualstudio.com/content/problem/25983/wcf-data-service-template-missing-in-vs2017.html