Portal Signup Button
The Format theme includes a customized Sign Up button within the subscription form. This button is located in the footer on all pages and in the header of the homepage.
Change custom portal button
To change texts of the custom subscription form, follow steps in this article -> /docs/format/settings-sitewide/subscription-form/
Restore standard Ghost Sign Up button
Code Injection is required to add custom CSS.
Standard Ghost button is hidden using CSS, but you can restore it with custom CSS if you want.
<style>
#ghost-portal-root > iframe {
display: block !important;
}
</style>