After adding a project, you may want to enable YouTrack integration, in order to be able to comment or to create issues.
To do so, navigate to your Project Settings, and select the tab Integrations. The YouTrack integration can be installed with one click. After installing it in a project, it will have to be configured be able to access your YouTrack installation:
Enabling YouTrack integration
After configuring your YouTrack integration with your server settings, you will have additional options when browsing the existing issues on the project: