To customize the title, welcome and thank you message in the evaluation that is sent to the candidate of your selection process, you can follow the following instructions:
In the "create review" field, you will go to "design";
There you can define a public title for your challenge, such as "Front-end Challenge";
You can then choose the welcome message to the test. Here's an example: "Welcome to the Front-end Developer technical test, we'll get back to you after the exam."
To finish your template, create a thank you message, as in the example: "Thank you for doing the challenge. Good luck!".
Check out the fields in the image below: