Testing bidding

Got the plugin set up and it went pretty smoothly (thanks!). But when I try to test a bid (from another computer that I’m not logged into). It brings me to the WordPress login page. Certainly bidders don’t have to log into WP to bid?

Any help is greatly appreciated and thank you!

Site is at:
http://www.ebcustomknives.com/st-jude-knife-auctions/

https://wordpress.org/plugins/ultimate-auction/