Adding CodeReview and Feedback WorkItems

Hi guys,

I pretty new to Azure DevOps and working with agile process. I checked the documentation from Microsoft how to set up my project in DevOps and how to add work items etc.

But I'm struggeling now how to track everything good in our development process. Basically I want to have I my agile process something like a code review and feedback/test item. And I the documentation from microsoft they talk about this types of work items.

But how can I add this to my project? I don't have a selection for that when I add a new work item.

Can anybody help and explain how this works? 

Thx 😊

Flo