If you created a review cycle and you want to change it's name, you can do so even after you've launched the review!
To do so:
Step 1: Navigate to the "Admin" panel found on the top navigation bar
Step 2: On the left Administration panel, select "Reviews"
Step 3: Find the review you would like to change the name of, and click into it:
On the left, you'll see "Create Cycle" greyed out. It's greyed out because you've already gone past this stage.
Step 4: Click back into "Create cycle"
Step 5: Click "Name" found under "Create cycle"
Step 6: Save and continue