I have fixed the link in your post above. In order to include a link in a post here in the forum, just write the URL without any markup. This will be handled by the forum software as a link to the given URL.
DokuWiki does not use markdown, so you don't have to understand markdown in order to properly use DokuWiki.
The DokuWiki syntax is well defined and explained in the documentation and you even have a copy in your very own wiki.
You can insert an image in your list without breaking the numbering quite easily.
Instead of writing this
- Beside "Enable the DHCP Server" select No. Click Apply.
- {{::asus_rt-ac68u-dhcp_server.jpg?651}}
- Under Advanced Settings, go to Administration
write this:
- Beside "Enable the DHCP Server" select No. Click Apply.\\ {{::asus_rt-ac68u-dhcp_server.jpg?651}}
- Under Advanced Settings, go to Administration
It's all explained in https://www.dokuwiki.org/faq%3Alists