To create a code review task click on Tests > Tasks Library > Press + Create new task and choose the Code review type of question.
Then just add the general settings of the test like title, tags, points value, suggested duration of the task, and the question itself.
Proceed with uploading the zip file with your code and the task will be ready.
NOTE: Code review tasks require manual evaluation because the answer is subjective. Some companies/developers will have preferred ways to solve a problem which will align to their best practices or mindset, which therefore means it cannot be said if it is the right or wrong by the machine that automatically marks it.