I get eBay US when I open "Search eBay". How do I switch it to eBay UK?
Please advise.

P.S.: the app is great. I won few items today!

You can change it in the Settings like you do with many other apps installed on your device.

The "Settings" icon is usually located on the first screen of your iPhone/iPad. It has 3 gray-color gears on it.
Just open the "Settings" app, scroll down to the list of apps, tap "Myibidder" so you can change its settings to your own preferences.
The option called "My eBay Site".

That solved my problem with some items from ebay.de (Germany), default eBay.com (US) shows:
"This listing (item number) has been removed, or this item is not available."

Changing Myibidder app setting "My eBay Site" to Germany fixed it. That was to easy ;)

Thanks, Sashka!