If for just this image, you can edit that post and in text editing mode you could add something like this around the link to the image:
<span style="float:left;padding:10px;"> ...<img>image link here... </span>
If you are looking to fix this for any image that is added to posts, you’d need to add a rule similar to this to your .css for the theme you are using. Some themes allow custom css to be added, check the settings/options for your theme.
img[class*="wp-image-"] {
padding: 10px;
}