Alright, let's get started! Open up your Adalo project and hit that "+" button to add a new screen. Choose the blank screen option so we can design a custom signup form from scratch. It's like a blank canvas, ready for your masterpiece.

Now, on this fresh screen, drag and drop input fields from the left sidebar onto the canvas. You'll need the usual suspects:

• Email
• Password
• Username
• Full Name

Make sure you set the "Field Type" correctly for each input. For example, the email field should be set to "email" and the password field to "password". Simple, right?

Next up, let's configure those input fields:

• Placeholder Text: Give users a hint, like "Enter your email".
• Required Field: Toggle the "Required" option if the field is mandatory.
• Field Type: For the password field, make sure it's set to "Password" so the input is masked. We don't want prying eyes, do we?

Time to add a button! Drag and drop a button onto the screen and label it something like "Sign Up". This button will be the magic trigger for user registration.

Let's make that button do something:

• Click on the button to open the "Actions" panel.
• Add a new action by clicking "Add Action" and select “Create User”.
• Map each input field to the corresponding data property. For example, map the email input to the email user property. Easy peasy.

Now, let's handle what happens after the signup action:

• In the same "Actions" panel, add a link to navigate to a new screen upon successful signup, like a welcome screen.
• Optionally, configure error handling to display an error message or keep the user on the signup screen. Nobody likes getting stuck, right?

Time to make it look good! Style the form to match your app’s design:

• Use the design panel to tweak colors, fonts, and spacing.
• Group fields and buttons for a cleaner look. A tidy form is a happy form.

Finally, let's test it out:

• Preview or publish your app and fill out the form with test data.
• Check if the signup process is smooth and if navigation works as expected.
• Verify that user data is stored properly in the database.

And there you have it! Your custom signup form is ready to roll.