In the default template of the blogger doesn't provide any search engine. So in order to give flexible access to the users you have to put your own search engine box using HTML. However, It is a very easy process. in this post I am going to show you how to add simple search box to you blog for searching stuff in your blog. All you need to do you have to add search code to your blog. So I have listed simple steps how to to add search code to your blog.
1) You need to go your Blogger and then select "Layout"
2) Select "Add a Gadget"
3) Then Select "HTML/JavaScript" gadget from the list by pressing plus sign. Once you click plus sign It will be appeared configure HTML/JavaScript window on your screen
4) Then you need to copy and paste following code inside the content box in configure HTML/JavaScript window and select save button.
<br /><form action="/search" id="searchThis" method="get" style="display: inline;">
<input id="searchBox" name="q" size="15" type="text" /><input id="searchButton" type="submit" value="SEARCH" /></form>
I hope this post help you, and more than happy to help you if you have any problem with adding search box to your blog, Thank you very much