You need to use the variables: night_phone_a (for the area code) night_phone_b (for the next 3 digits) night_phone_c (for the last 4 digits) Just for demo purposes, I tweaked your example to include the variables and removed the line: <input type="hidden" name="amount" value=""> - you're already using the "amount" variable with the text input. Tip: Make sure you clear your web browser's cookies each time when testing code - else sometimes you get unexpected results. <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="description" content="">
<meta name="keywords" content="">
<title>Test Example</title>
</head>
<body>
<!-- Start if Form -->
<form id="wf-form-Donation-Form" action="https://www.paypal.com/cgi-bin/webscr" method="post" class="donation-form-holder">
<input type="hidden" name="business" value="CZ3FJSD3WZGDU">
<input type="hidden" name="cmd" value="_donations">
<!-- Specify details about the contribution -->
<input type="hidden" name="item_name" value="Donation to Cypress Assistance Ministries">
<input type="hidden" name="item_number" value="Web Donation">
<input type="hidden" name="currency_code" value="USD">
<!-- Text Input Boxes -->
<label for="first-name last-name" class="donation-form-label">Name: <br></label>
<input type="text" class="donation-field first-name w-input" maxlength="256" name="first_name" placeholder="First name" id="first-name" required="">
<br><br>
<input type="text" class="donation-field last-name w-input" maxlength="256" name="last_name" placeholder="Last name" id="last-name" required="">
<br><br>
<label for="donation-email" class="donation-form-label">Email Address:</label>
<input type="email" class="donation-field w-input" maxlength="256" name="email" placeholder="Email address" id="donation-email" required="">
<br><br>
<label for="donation-phone" class="donation-form-label">Phone Number:</label>
<input type="tel" class="donation-field w-input" maxlength="3" minlength="3" name="night_phone_a" placeholder="Enter your phone number area code" id="donation-phone" required="">
<input type="tel" class="donation-field w-input" maxlength="3" minlength="3" name="night_phone_b" placeholder="Enter next 3 Digits" id="donation-phone" required="">
<input type="tel" class="donation-field w-input" maxlength="4" minlength="4" name="night_phone_c" placeholder="Enter next 4 Digitd" id="donation-phone" required="">
<br><br>
<label for="amount" class="donation-form-label">Donation Amount:</label>
<input type="text" class="donation-field w-input" name="amount" placeholder="Enter your donation amount">
<br><br>
<input type="image" name="submit" src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" alt="Donate"> <img alt="" width="1" height="1" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif">
</form>
<!-- End of Form -->
</body>
</html>
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