proxy error

I'm having the worst trouble connecting to this http/https proxy. I've done everything suggested including adding my ip to the auth list... everything times out and no connection is established. I was wondering if it could be an issue with my computer settings... i use a mac Can anyone help...

Hello fellow blackhatters, I have a few questions. This may seem silly, but do not ask are more stupid for me. I want to use ScrapeBox for link building. I read that comment posters should not be done using public proxies. I am Newbie at this. I bought proxies from yourprivateproxy.com, and...