If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
How do I wrap text around a photo and manipulate it the way I want?
If you are talking about within wordpress’s own visual editor, you can select the image and then hit the little image icon that appears hovering over it. Then hit align left or make the image float and for text to wrap around it.
Here is a pretty good introduction to the visual editor though its for WordPress.com blogs so it may reference those features a bit but it is still a great resource:
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