If you wants to add a new label for Single or Multiple posts which were written previously, then go to Blog Dashboard and click on Post Section from Left Sidebar and you will be able to see as shown in the screenshot below. Next, click label icon to popup a dropdown menu and click New Label to add label for the selected posts as shown below.
After clicking you will be asked to enter the name of a label(I will enter label Blogger Tutorials ), write it and then click "ok". A new label will be assigned to posts you selected.
If you want to add new label to certain articles/posts which are written previously on blog, then click 'All Labels' and select label name as you wish as shown below.
After that select Label icon and add new label to the selected posts as shown in above screenshots. Done!!!
Note: Be careful while adding a new label for multiple posts, sometimes it might get really messy.
Labels are extremely useful to generate related articles/posts of same label, which in turn improves blog page views and also improves bounce time on your blog.
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