Dreamweaver's interface doesn't have a button for "Wrap Text", but it can be done from within the CSS Designer Window, you just need to know what setting to change and how to find it.
If you're working outside of the Bootstrap framework in DW, use the steps below. If you are using Bootstrap, someone else should be along to tell you the class name needed to add float:left or float:right to your existing images.
1. Click the image you want wrapped by text in Design View
2. In the Properties window, give the image a unique ID (no spaces, no special characters)
3. Open the CSS Designer under Window > CSS Designer
4. In the CSS Designer, click the <style> tag or the name of the external CSS file under Sources.
a. If you don't have an external CSS file, clcik the + and choose Define in Page. That will create a <style> option
b. If you do have one, or don't want to use Embedded CSS, choose Attach Existing CSS File
5. In the CSS Designer, click the + next to Selectors. This should automatically fill in a selector with the ID from step 2.
6. Hit Enter/Return to create the Selector
7. In the CSS Designer, click the + next to Properties,
8. Make sure the "Show Set" box is unchecked
9. Scroll down to Float (about 1/4 of the way through the list) and click either left or right (there is no float:center)
10. You will also likely need to add a little left and right margin to the image (a little above Float in the list) to keep the text from touching the image
This can be done in a few keystrokes using DW's code hinting, but it does require a basic knowledge of css properties. Nancy's links will likely serve you better than my lists of steps in DW's poorly conceived CSS Designer.