How To Add A (Custom) Field To An Order Form

[php]<br /><br />&lt;STRONG&gt;*IMPORTANT - This information is necessary to personalize your package&lt;/STRONG&gt;<br />&lt;br&gt;<br />&lt;div id="productInformation"&gt;<br /><%%KEEPWHITESPACE%%> &lt;div id="productInformation"&gt;<br /><%%KEEPWHITESPACE%%> &lt;table class="accountTable tabular grid"&gt;<br /><%%KEEPWHITESPACE%%> &lt;tbody&gt;&lt;tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;th colspan="2" class="leftAlign"&gt;Your Personal Membership Information&lt;/th&gt;<br /><%%KEEPWHITESPACE%%> &lt;/tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;td class="rightAlignTop"&gt;&lt;label class="checkoutLabel"&gt;* Birthdate &lt;/label&gt;&lt;/td&gt;<br /><%%KEEPWHITESPACE%%> &lt;td&gt;&amp;nbsp;&lt;input class="regula-validation checkoutTop" id="Contact0Birthday" name="Contact0Birthday" size="10" placeholder="" type="date"&gt;<br /><%%KEEPWHITESPACE%%> &lt;/td&gt;<br /><br /><%%KEEPWHITESPACE%%> &lt;/tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;td class="rightAlign"&gt;<br /><%%KEEPWHITESPACE%%> &lt;label class="checkoutLabel"&gt;<br /><br /><%%KEEPWHITESPACE%%> * Create Password<br /><br /><%%KEEPWHITESPACE%%> &lt;/label&gt;<br /><%%KEEPWHITESPACE%%> &lt;/td&gt;<br /><%%KEEPWHITESPACE%%> &lt;td&gt;&amp;nbsp;&lt;input class="regula-validation checkout" id="Contact0Password" name="Contact0Password" size="16" type="password"&gt;<br /><br /><%%KEEPWHITESPACE%%> &lt;/td&gt;<br /><%%KEEPWHITESPACE%%> &lt;/tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;tr&gt;<br /><%%KEEPWHITESPACE%%> &lt;td&gt;&amp;nbsp;&lt;/td&gt;<br /><%%KEEPWHITESPACE%%> &lt;/tr&gt;<br /><br /><%%KEEPWHITESPACE%%> &lt;/tbody&gt;&lt;/table&gt;<br />&lt;/div&gt;<br />&lt;/div&gt;<br /><br />[/php]