Once you have added a CTA you have three buttons you can use to modify it.
The first button is the edit button, clicking on it will make the CTA in the same row editable so you can change the label or URL, it will also hide the normal Edit/Delete/Reorder buttons and replace them with an orange Save button.
Once you have edited the CTA hit the orange save button.
Clicking this will immediately delete the CTA in the same row as the button, click with caution :)
Click and drag on this button to change the order of the CTA.
Remember to save the event, match, or event series that your CTA is held within in order to save your changes to the CTAs.