at fist you must add this script to your page:
<script src="https://apis.google.com/js/plusone.js"></script>
for adding +1 button add below code: (note:don't forget change the href attribute to your own address)
<g:plusone href="http://Mampel.ir"></g:plusone>
for adding g+ sharing button add below code: (note:don't forget change the href attribute to your own address)
<g:plus action='share' href='http://Mampel.ir'> </g:plus>
for learn more follow these websites: