Mailchimp forms

Hi guys, how do I change SIGN UP grey button to : #b89f80 and how to I made the placeholder in bold please and add the * please?

<!-- Begin MailChimp Signup Form -->
<link href="//" rel="stylesheet" type="text/css">
<style type="text/css">
	#mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif;  width:200px;}
	/* Add your own MailChimp form style overrides in your site stylesheet or in this style block.
	   We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. */
<div id="mc_embed_signup">

    <div id="mc_embed_signup_scroll">
<div class="mc-field-group">
<input type="text" value="" name="FNAME" class="" id="mce-FNAME" placeholder="FIRST NAME" required>
<div class="mc-field-group">
<input type="text" value="" name="FNAME" class="" id="mce-LNAME" placeholder="LAST NAME" required>
<div class="mc-field-group">

<input type="email" value="" name="EMAIL" class="" id="mce-EMAIL" placeholder="EMAIL" required>

<div class="mc-field-group">
<input type="text" value="" name=" MMERGE3" class="" id=" mce-MMERGE3" placeholder="COUNTRY" required>
	<div id="mce-responses" class="clear">
		<div class="response" id="mce-error-response" style="display:none"></div>
		<div class="response" id="mce-success-response" style="display:none"></div>
	</div>    <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
    <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_8172f23fe9be1726052d983f1_2ff58ba8a1" tabindex="-1" value=""></div>
    <div class="clear"><input type="submit" value="SIGN UP"style=”background: #b89f80” name="SIGN UP" id="mc-embedded-SIGN UP" class="button"></div>

<script type='text/javascript' src='//'></script><script type='text/javascript'>(function($) {window.fnames = new Array(); window.ftypes = new Array();fnames[1]='FNAME';ftypes[1]='text';fnames[2]='LNAME';ftypes[2]='text';fnames[0]='EMAIL';ftypes[0]='email';fnames[3]='MMERGE3';ftypes[3]='text';}(jQuery));var $mcj = jQuery.noConflict(true);</script>
<!--End mc_embed_signup-->