How do I get text to go around a picture?

Write all the text for your post.
Place the cursor where you want the picture to be:

 

When your picture is uploaded, click the image and 'Send to Editor'.
It will appear where the cursor was.

 

Now click the picture.
And then click the 'Align left' button

 

The picture will move and the text will wrap around it.

 

 

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If you do not use the Visual Rich Editor you can still do this:

After you've inserted the image into the post, before the closing /> simply put in align="left" or align="right".

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And you can do this to the left, or the right, or both.