You need to replace some special characters. Here's how we gonna do some tweak:
< replace with <
> replace with >
& replace with &
" replace with "
space replace with
Another important thing you should not forget is to add <pre><p> from the beginning of codes in order to determine that you are writing an HTML code. Add also </p></pre> at the end of your HTML codes.
In order to move to the next line add <br/> before each line of the codes. And lastly, you make sure to select EDIT HTML mode and not COMPOSE MODE.
Still Confuse? To illustrate more, here's a sample on how the tweak will work. Below is the sample of HTML codes you want to post.
<b:includable id='post' var='post'>
<div class='post uncustomized-post-template'>
<a expr:name='data:post.id'/>
<b:if cond='data:post.title'>
<h3 class='post-title'>
<b:if cond='data:post.link'>
If you want to post the above code, it will look like this: Make sure that you are on EDIT HTML mode.
<pre><p><b:includable id='post' var='post'>
<br/><div class='post uncustomized-post-template'>
<br/><a expr:name='data:post.id'/>
<br/><b:if cond='data:post.title'>
<br/><h3 class='post-title'>
<br/><b:if cond='data:post.link'></p></pre>Cheers! Very Easy. Leave a comment or any questions on my post.
Another simple way and hassle free, Go to Simplebits and just copy and paste the HTML.