1. Log in to blogger and Go to Design >> Page Element
2.Now click Add Gadget and select the HTML/Javascript
3.Now paste below code.
<a href="ymsgr:sendIM? yahooid ">
<img src="http://opi.yahoo.com/online?u= yahooid &m=g&t= 1 &l=us"/>
</a> </ A>
*Replace yahooid with your yahoo id
*Replace 1 with your like. see the below image list and put your number.
Image list
5. Now click save. you are done.
