This here is the forum where we can discuss DokuWiki. The software which runs this forum is not DokuWiki. Dokuwiki is a wiki, and a wiki is not a forum.
This forum uses another markup for marking up the posts. It is called Markdown.
There are several places in this forum where it's explained how to post links and images in a post. In your post above you should have placed the URL where you put 'src'. You then could have placed a term which is to be shown as alt text where you put the URL.