Contact Us Button Is Used To Take Attention Of Visitor. First You Need To Create Contact Form. If Already Created Then Follow These Steps To...

Contact Us Button Is Used To Take Attention Of Visitor. First You Need To Create Contact Form. If Already Created Then Follow These Steps To Add Floating Contact Us Button To Your Blog.

Login To Blogger Account.
Click Blog Title → Template → Edit HTML.
Click Proceed Button.
Find <Body> Tag In Your Template, Then Add The Following After It.

<a href='Contact Us Link' style='position: fixed;top:35%; left:0%;'><img border="0" height="102" src="http://4.bp.blogspot.com/-bPMgWQfCMTw/T9mp0Bp0n2I/AAAAAAAAAsw/yOG5E0Bzruk/s320/Contact%2BUs.png" width="35" /></a>

Click Save Template Button And You Are Done.

Note: Don't Forget To Replace Contact Us Link Text With Your Contact Us Link. You Can Also Change Contact Us Button By Replacing Image URL. Also Change Height And Width According To Image.