Here, you can add a logo to the block, change the title, as well as set a background image for the whole block.
Here, you can configure the form fields. Apart, from the Name field, which can be enabled or disabled, you have the Email and Password. The placeholder texts of these fields can be modified.
Lastly, there's the Sign Up button. The button Text can be changed, while the Action is predefined and can't be modified.
Lastly, we need to set what page the user should be taken to after successfully signing up. We also need to set the Action of the Signin button, which the user can use if he/she has already registered. In most of the cases, you'd need to set the Action to open the Signin page.