Hi chuckiii3,
To accomplish this, you just have to have your Auctiva username changed to "charlesiii3" to correspond with your eBay username.
I went ahead and made this change so your Auctiva username is now "charleseiii3" and your Auctiva store URL is now http://store.auctiva.com/charleseiii3
Please let me know if I can be of further assistance.
-Mike