You can change both the wording and the styling of the ‘Submit’ button under Theme → UI Elements → Submit Button in the form editor.
The Submit Button section contains the ability to;
For Pro and Agency users
If you want event more control over the look and feel of our form, we offer CSS & HTML on the Agency plan.
Options to style the submit button when using Guided Mode are not available.
When Guided Mode is enabled, you may only change the following options: