Adding Add ins into Outlook

Question

https://www.c-sharpcorner.com/UploadFile/1ce8ad/add-ribbon-control-in-outlook-2013-using-outlook-2013-add-in/

 

 

This Article I followed but the add-in is not reflected into the outlook please give a brief about this 

 

 Concern :

 

I need to add Add-in into the  Outlook Application how??