Can I edit my test after it has started?
Once a test has started, it is not possible to edit the variants for that test. However, your test settings that are not related to your variants are still editable. This is because if you change anything in a variant - the results immediately become meaningless because it is not possible to know for sure what caused the difference in sales, sessions and profits.
If you need to edit variants for a test that has started, you should pause/abort the test, clone it, edit it and then run it. The clone feature makes an exact copy of the current test - but you can still edit anything before you run it.