1. Go to your Dashboard >> Design >> Edit HTML >> Expand Widget Template.
2. Scroll down to where you see this code.
Remove/Hide Post Time :
Find this code below or exact and delete it.
<span class='post-timestamp'>
<b:if cond='data:top.showTimestamp'>
<data:top.timestampLabel/>
<b:if cond='data:post.url'>
<a class='timestamp-link' expr:href='data:post.url' rel='bookmark'
title='permanent link'><abbr class='published'
expr:title='data:post.timestampISO8601'><data:post.timestamp/></abbr></a>
</b:if>
</b:if>
</span>
Remove/Hide Post Author :
Find this code below or exact and delete it.
<span class='post-author vcard'>
<b:if cond='data:top.showAuthor'>
<data:top.authorLabel/>
<span class='fn'><data:post.author/></span>
</b:if>
</span>
Remove/Hide Post Date :
Find this code below or exact and delete it.
<data:post.dateHeader/>
Save your template and you' are done!