Now select your category and add your all the details and create the page. Now after creating the google plus page add that widget on your blog. Adding to blogger blog
1. go to design > page element
2. Click add a gadget and select HTML/Javascript gadget.
3. Copy the bellow code and paste it inside content box.
<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>
<!-- Place this tag where you want the badge to render -->
<div class="g-plus" data-href="your paste Google + page url here" data-size="badge"></div>