Need help with a subdomain

I’m hoping that someone here might be able to help me finalize my idea of how to get my instalation of WordPress working properly on my site.

I had offered to host a secondary site to a bunch of friends on my site using a subdomain, wom.seferia.net This subdomain works perfectly at getting visitors to the main page. However, every other page reverts to seferia.net/wom. Also, it will log one out if one types wom.seferia.net once more.

I’ve tried messing with the setting for what directory wordpress accesses, but those attempts have resulted in various errors.

So, I’m not certain how to make it so that all pages in that folder utilize the subdomain.

This is not a major issue, for the link does work to get someone to the site. However, I’d like to try to perfect how it works.