Follow below steps to add most commented or most popular widget on your blog.
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Click Add a Gadget > HTML/JavaScript

4. Insert below code > title Most Commented > Save<script type="text/javascript">
function pipeCallback(obj) {
document.write('<ul style="text-transform: capitalize;">');
var i;
for (i = 0; i < obj.count ; i++)
{
var href = "'" + obj.value.items[i].link + "'";
var item = "<li>" + "<a href=" + href + ">" + obj.value.items[i].title + "</a> </li>";
document.write(item);
}
document.write('</ul>');
}
</script>
<script src="http://pipes.yahoo.com/pipes/pipe.run?_render=json&_callback=pipeCallback&_id=a7d3195528df5e96181a3d2712266226&url=http%3A%2F%2Fyourblog.blogspot.com&num=5" type="text/javascript"></script>
Change yourblog and num=5
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5. View Blog
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Follow below steps to add recent posts by label or category widget on your blog.
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Click Add a Gadget > Feed

4. Insert Feed URL > Continue > title Recent LabelName > Save
Feed URL example: http://yourblog.blogspot.com/feeds/posts/default/-/Label Change yourblog.
Important:
Label is case sensitive. So, if your label is Tips, your feed URL is http://yourblog.blogspot.com/feeds/posts/default/-/Tips not http://yourblog.blogspot.com/feeds/posts/default/-/tips.
If your label has more than one word, use %20 to replace space between words. For example, if your label is Blog Title, your feed URL is http://yourblog.blogspot.com/feeds/posts/default/-/Blog%20Title.
click the image to enlarge
click the image to enlarge
You can tick Item dates and Item sources/authors if you want to show it.
5. View Blog
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Follow below steps to add recent comments widget on your blog.
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Click Add a Gadget > Feed

4. Insert Feed URL > Continue > title Recent Comments > Save
Feed URL example: http://yourblog.blogspot.com/feeds/comments/default Change yourblog
click the image to enlarge
click the image to enlarge
You can tick Item dates and Item sources/authors if you want to show it.
5. View Blog
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Follow below steps to add recent posts widget on your blog.
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Click Add a Gadget > Feed

4. Insert Feed URL > Continue > title Recent Posts > Save
Feed URL example: http://yourblog.blogspot.com/feeds/posts/default Change yourblog
click the image to enlarge
click the image to enlarge
You can tick Item dates and Item sources/authors if you want to show it.
5. View Blog
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Sometimes, after you installing new blogger template, you will see "Undefined" date. So, how to fix this problem?
Method 1: [go to Method 2]
1. Goto blogger.com & login
2. On Dashboard, click Layout > Page Elements

3. Edit Blog Posts 
4. Change timestamp format from normal time to long date
from
to
5. Save
Method 2: [go to Method 1]
1. Goto blogger.com & login
2. On Dashboard, click Settings > Formatting

3. Change timestamp format from normal time to long date
from
to
4. Save Settings
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1. Goto WP Blogger Themes & choose a template
2. Download & Save file

3. Extract Blogger Template - "TemplateName".zip
4. Goto blogger.com & login
5. On Dashboard, click Layout > Edit HTML 

6. On Backup / Restore Template, click Browse
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7. Choose Blogger Template - "TemplateName".xml & click Upload
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8. View Blog
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