1. Sign in to the Supabase dashboard.
2. Click on the "New Project" button.
3. Enter the necessary project details and create the project.
4. Once the project is created, take note of the API keys provided.

1. Navigate to the Supabase dashboard and open your project.
2. Go to the "Authentication" section.
3. Click on the "Policies" tab.
4. Create roles like admin, editor, and viewer by adding rows to the auth.roles table.

1. In the Supabase dashboard, head over to the "Database" section.
2. Click on the "Table Editor" tab.
3. Select the table you want to secure.
4. Click on the "Policies" tab for the selected table.
5. Click on "Create Policy" and define the policy to restrict access based on roles.

• Example for admin only:
  ```
  CREATE POLICY "Admins can perform all operations"
  ON your_table_name
  FOR ALL
  USING (auth.role() = 'admin')
  WITH CHECK (auth.role() = 'admin');
  ```

1. In the "Authentication" section of the Supabase dashboard, go to "Settings," then "Auth Guards."
2. Create new guards by assigning them conditions based on roles.

• Example conditions:
  ```
  IF auth.role = 'admin' THEN
  return true
  ELSE
  return false
  ```

1. In the Supabase dashboard, navigate to the "Functions" section.
2. Select the function you want to secure.
3. In the function editor, update the code to include role checks.

• Example:
  ```sql
  CREATE OR REPLACE FUNCTION secure_function()
  RETURNS void
  LANGUAGE plpgsql
  AS $$
  BEGIN
  IF auth.role() != 'admin' THEN
  RAISE EXCEPTION 'Unauthorized';
  END IF;
  -- Function logic here
  END;
  $$;
  ```

1. Create test users with different roles using the "Authentication" section.
2. Attempt to perform actions as each user to verify that access controls are working as intended.
3. Adjust the policies and role-based access as necessary based on test results.

By following these steps, Supabase functions can be effectively secured with role-based access controls.