How to add input boxes

How do you add input boxes to Ultra simple paypal to get input from cutomers. Below is a example of the input boxes i need.

https://www.celebrateitballoons.com/homecoming-garter-2.html

In Expression web, i was able to do but, the code dosent seem to work in wordpress.

Here is the code
</td>
<td valign=”top”><form target=”_self” action=”https://www.paypal.com/cgi-bin/webscr&#8221; method=”post” name=”myform” style=”width: 309px”>
<div>
<input type=”hidden” name=”on0″ value=”Purchase Type”/>
<input name=”os0″ type=”radio” value=”Standard Single Mum”/><span class=”style30″>Standard Single Mum $80.00
</span>

<span class=”style31″>
<input name=”os0″ type=”radio” value=”Senior Single Mum”/></span><span class=”style30″>Senior Single Mum, $100.00</span>

<span class=”style31″>
<input name=”os0″ type=”radio” value=”Deluxe Single Mum”/></span><span class=”style30″>Deluxe Single Mum, $135.00</span>

<span class=”style31″>
<input name=”os0″ type=”radio” value=”Deluxe Senior Single Mum”/></span><span class=”style53″>Deluxe
Senior Single Mum, $135
</span>
<span class=”style32″>

</span>

<input type=”hidden” name=”on1″ value=”First Name”/>
<input type=”text” name=”os1″ size=”20″/> <span class=”style30″>First Name
</span>

<input type=”hidden” name=”on2″ value=”Last Name”/>
<input type=”text” name=”os2″ size=”20″/> <span class=”style30″>Last Name
</span>

<span class=”style31″>
<input type=”hidden” name=”on3″ value=”Email”/>
<input type=”text” name=”os3″ size=”20″/></span><span class=”style30″> Email Address</span>

<input type=”hidden” name=”on9″ value=”Last Name”/>
<input type=”text” name=”os9″ size=”20″/> <span class=”style30″>Contact Number</span>
<span class=”style31″>
<input type=”hidden” name=”on4″ value=”School”/>
<input type=”text” name=”os4″ size=”20″/></span><span class=”style30″> School Name
</span>

<span class=”style31″>
<input type=”hidden” name=”on5″ value=”School colors”/>
<input type=”text” name=”os5″ size=”20″/></span><span class=”style30″> School Colors</span>

<span class=”style31″>
<input type=”hidden” name=”on6″ value=”Homecoming Date”/>
<input type=”text” name=”os6″ size=”20″/></span><span class=”style30″> Homecoming Date</span>

<span class=”style31″>
<input type=”hidden” name=”on7″ value=”Name on Mum”/>
<input type=”text” name=”os7″ size=”20″/></span><span class=”style30″> Name on Mum
</span>

<span class=”style31″>
<input type=”hidden” name=”on8″ value=”Grade”/>
<input type=”text” name=”os8″ size=”20″/></span><span class=”style30″>Grade (9th, 10th, 11th)</span>

<span class=”style30″>Quantity
</span>

<input type=”text” name=”quantity” value=”” size=”4″ style=”width: 47px”/>

<input name=”submit0″ id=”duckform” onclick=”CalculateOrder(this.form)” type=”image” alt=”Make payments with PayPal – it’s fast, free and secure!” src=”../../x-click-but22.gif”border=0 name=”submit” align=”top”/>
<input type=”hidden” name=”cmd” value=”_cart”/>
<input type=”hidden” name=”add” value=”1″/>
<input type=”hidden” name=”business” value=”[email protected]”/>
<input type=”hidden” name=”item_number”/>
<input type=”hidden” name=”item_name” value=”Homecoming Mum”/>
<input type=”hidden” name=”amount”/>
<input type=”hidden” name=”shipping” value=”15.00″/>
<input type=”hidden” name=”no_note” value=”1″/>
<input type=”hidden” name=”mrb” value=”R-3WH47588B4505740X”/>
<input type=”hidden” name=”pal” value=”ANNSXSLJLYR2A”/>
<input type=”hidden” name=”shopping_url” value=”https://www.celebrateitballoons.com/homecoming/Homecoming.htm”/&gt;
<input type=”hidden” name=”return” value=”www.celebrateitballoons.com/homecoming/Homecoming.htm” />
<input type=”hidden” name=”cancel_return” value=”https://www.celebrateitballoons.com/homecoming/Homecoming.htm”/&gt;
<input type=”hidden” name=”currency_code” value=”USD”/>
<input type=”hidden” name=”lc” value=”US”/>
<input type=”hidden” name=”bn” value=”PP-ShopCartBF:btn_cart_LG.gif:NonHosted”>
</div>
</form>

thank you for your help

https://www.ads-software.com/plugins/wp-ultra-simple-paypal-shopping-cart/