Hi Royston
We have designed this theme in this way. Yes you are right header-image link is no shown.
So anchor your header image you need to create the ch;ld theme. The header code is inside
attitude-pro -> library-> structure -> header-extension.php
If you replace or edit the code then you will lost this if you update. So you create the child theme and can add function. keep this code inside anchor tag
“>
For more refrence of child theme go to
https://codex.wordpress.org/Child_Themes
Regards
Sunil