To edit the button on a phishing email when creating your simulation, you first need to ensure you have Create your own Phish selected when within the Email section: 

• Next, select your phishing template through Choose Email:

• Once you've opened your phish template, it may include an interactive button like the example shown below: 

• If you want to change this button text, simply select Source at the top of the template editor: 

• Search the code until you find the current button text. You can now edit this text within this code segment, ensuring you only change the displayed text: