they didn't include the suction cup holder because they are selling it as an add on
Look at the card in the picture from their site - that sure looks like a alfa card too me.. Which are good cards.
But your not suppose to use it at the same time as your built in card, atleast not connected to the same wireless network, etc.
Disable your built in card, and just use the new wireless card you purchased -- again its not a BOOSTER, that is just their marketing nonsense.
What is the model number on the card? From the shape I would say its a alfa card.
As to not connecting to a network, not the correct WPA PSK, WEP KEY would be my guesses. What is the setting on the network? WPA, WPA2, WEP, is mac filtering enabled?
"boosting the strength on some."
Yeah that's called an antenna with gain

Vs that not very good antenna in your laptop case, etc.