Hey,
Just to be clear was it this Guild Chat and Recruiting Section? https://forums.d2jsp.org/forum.php?f=13
In this you should be able to find Guilds that have Topics focused around Guild Membership Applications. When you click on a Guild you can view the "Forum" they have, which may display one of those topics you would be interested in. Do note Guilds can have a variety of topics and they are usually self managed by the Guild Members. IE Different Topic Titles and access can be user created and changed in real time.