You can assign a test when you're ready to implement it. We recommend assigning tests during the weekly growth meeting to the person who's responsible for getting it done during the weekly sprint. Only Growth Masters can assign tests to other team members.
To assign a test, mouse over the test and click on the "Assign" option.
If you need to edit who the test is assigned to, click through to the idea and mouse over the name of the person it's presently assigned to.