I am trying to add counties to the Virginia UID wiki off the main page. I cant figure out how to get a new page created with the TAG to append the main wiki catagory page.
It sounds like you're looking at the category list. To add a new page that will show up in the category list.
To create the page, go to the main Wiki page for the county (The easiest way to get there is to go to your county in the RRDB and click on the "Wiki" link). Once you get to the main Wiki page for your county, click "Edit" from the Actions Menu at the top right, and add a link to your new page:
So for example, if I was going to create a page for King George County Radio IDs:
[[King George (VA) Radio IDs]]
Save the page and then the link will appear. Click on the link and you are ready to start editing.
Once you've started the new page, at the bottom of the new page insert the following:
[[Category:Virginia RID/UIDs]]
This will automatically add it to the "Virginia RID/UIDs" category page once you've saved it.