Some what it's not that complicated to add this widget into your blog, not at all. What you have to do to add it is just to copypass some lines of code into your blog, you don't even need to edit your template code. Pay attention on the below.
1. Go to your blogger dashboard.
2. Go to design.
3. Click on add gadget where you suppose the widget to show up.
4. After, you'll be taken to the gadget page, just click on/add the Html/Javascript widget and then simply copypass the code below into the text box.
To be the lesser arrangement code in the text box above looks like the below:
< script type="text/javascript">
var randarray = new Array();
var l=0;
var flag;
var numofpost= 20;
function randomposts(json) {
var total = parseInt(json.feed.openSearch$totalResults.$t,10);
for(i=0; i < numofpost;)
{ flag=0; randarray.length=numofpost; l=Math.floor(Math.random()*total);
for(j in randarray) {
if(l==randarray[j]) { flag=1; }}
if(flag==0&&l!=0) { randarray[i++]=l; }}
document.write('< ul>');
for(n in randarray) { var p=randarray[n];
var entry=json.feed.entry[p-1];
for(k=0; k < entry.link.length; k++) {
if(entry.link[k].rel=='alternate') {
var item = "< li>" + "< a href=" + entry.link[k].href + ">" + entry.title.$t + "< / a> < / li>";
document.write(item); }}
}
document.write('< / ul>'); }
< / script>
< script src="/feeds/posts/default?alt=json-in-script&start-index=1&max-results=10000&callback=randomposts" type="text/javascript">< / script>
5. Save your widget and check if your random post is running properly, and don't forget to say thank you to me. And by the way, saying "Thank You", poeple could be charged with "$" in my country. 
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