Install the Hatica Jenkins app from the Connections page inside Hatica. You might have to generate and add an API key to complete the connection.
This is a step-by-step guide that shows how to generate a API token in Jenkins
Head over to the admin panel by clicking on the "admin" button which can generally be found on the top right corners of your Jenkins interface
Select Configure from the left panel to enter the configure part of the admin panel
Click on Add new Token.
Then, add a name to the token and click on the "Generate" button to generate a API key for this application.
Just copy and paste the newly generated API token in Hatica when prompted.