In blogger you can limit the number of posts appearing on the home page, but you cannot to do it on the label pages.
In this post I will show you how to limit the number of posts showing in label pages.
Changing the code for in-post and label post labels gadget labels :
Logging to your Blogger account
Go to Dashboard > Design > Edit HTML
Back up your template
Tick the Expand Widget Templates check box on top right of the HTML window. Look for following line in HTML code :
You may find more than one instance. Replace them with the following :