Here is a screenshot. Says bad request. Does that mean I have set these up incorrectly in sb or r they just bad proxies? Is there a setting you have to change in sb for private? BTW, the privates are the last 10 in the screenshot. Any help appreciated.

the best thing to do is to write to the support on the site where you bought it

There's nothing special to do for private proxies. You just have to make sure they're entered in the correct format...

Code:

ip:port:username:password

If they don't work after doing that go back to the vendor.