Here it is. I’ve added the tags that keep the payment button from going to the bottom of the page.
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<div style="display: none;">
<input type="hidden" name="business" value="jmattmiller16@gmail.com" />
<input type="hidden" name="cmd" value="_xclick" />
<!-- Instant Payment Notification & Return Page Details -->
<input type="hidden" name="notify_url" value="http://teamup-tn.com/?s2member_paypal_notify=1" />
<input type="hidden" name="cancel_return" value="http://teamup-tn.com/" />
<input type="hidden" name="return" value="http://teamup-tn.com/?s2member_paypal_return=1" />
<input type="hidden" name="rm" value="2" />
<!-- Configures Basic Checkout Fields -->
<input type="hidden" name="lc" value="" />
<input type="hidden" name="no_shipping" value="1" />
<input type="hidden" name="no_note" value="1" />
<input type="hidden" name="custom" value="teamup-tn.com" />
<input type="hidden" name="currency_code" value="USD" />
<input type="hidden" name="page_style" value="paypal" />
<input type="hidden" name="charset" value="utf-8" />
<input type="hidden" name="item_name" value="TEAM Up Tennessee one-year membership" />
<input type="hidden" name="item_number" value="1::1 Y" />
<!-- Configures s2Member's Unique Invoice ID/Code -->
<input type="hidden" name="invoice" value="<?php echo S2MEMBER_VALUE_FOR_PP_INV(); ?>" />
<!-- Identifies/Updates An Existing User/Member ( when/if applicable ) -->
<input type="hidden" name="on0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON0; ?>" />
<input type="hidden" name="os0" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS0; ?>" />
<!-- Identifies The Customer's IP Address For Tracking -->
<input type="hidden" name="on1" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_ON1; ?>" />
<input type="hidden" name="os1" value="<?php echo S2MEMBER_CURRENT_USER_VALUE_FOR_PP_OS1; ?>" />
<!-- Controls Modify Behavior At PayPal® Checkout -->
<input type="hidden" name="modify" value="0" />
<!-- Customizes Prices, Payments & Billing Cycle -->
<input type="hidden" name="amount" value="15" />
<!--<input type="hidden" name="src" value="BN" />-->
<!--<input type="hidden" name="srt" value="" />-->
<!--<input type="hidden" name="sra" value="1" />-->
<!--<input type="hidden" name="a1" value="0" />-->
<!--<input type="hidden" name="p1" value="0" />-->
<!--<input type="hidden" name="t1" value="D" />-->
<!--<input type="hidden" name="a3" value="15" />-->
<!--<input type="hidden" name="p3" value="1" />-->
<!--<input type="hidden" name="t3" value="Y" />-->
<!-- Displays The PayPal® Image Button -->
</div>
<input type="image" src="https://www.paypal.com/en_US/i/btn/btn_xpressCheckout.gif" style="width:auto; height:auto; border:0;" alt="PayPal®" />
</form>