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There are some pages like your contact page, about page, table of contents page where you don't want label tags or "Posted by Author at xyz time" text to appear.
1.Go To Blogger > Design > Edit HTML
2.Backup your template
3.Check the "Expand Widget Templates" box
4.Search For, <span class='post-labels'>
5.Now add the following code just above it,
Replace URL OF Selected Post with the Link of the page where you want to hide label tags.
6. Just 6-7 lines below the code you search for in step#4, you will find this,
</span>
7. Just after it paste the code below,
</b:if>
8. Save your template and visit that selected page and you will see that the labels are gone.
If you faced any problem just let me know. It would be a pleasure to help you.