How to insert an image in html using brackets?

[Alfie]

you need the full path to where the image is stored. If it's in the same folder as the html file then your code should work but lets say it's in a folder called 'images' and the images folder is in the same folder as the html file it would be
<img src="images/twitter.jpg" /> (note the forward slash before the closing '>'
You should aslo include the width and height of the image and an alt tag to describe it.

Assuming the twitter image is 20 pixels square your code would be
<img src="images/twitter.jpg" width="20" height="20" alt="Twitter Icon" />

You could also add a title tag and a class to the image if you wanted to