Wrap the img tag part with url tag for example
will result with clickable image like this
Code:
[url=http://www.facebook.com]
[img] https://i.gyazo.com/8750811c540479636bd4d0240d08a5bc.png [/img]
[/url]
Note the target placement inside the url bracket[img] https://i.gyazo.com/8750811c540479636bd4d0240d08a5bc.png [/img]
[/url]
will result with clickable image like this