How do I program my Multi-Code gate opener?

My landlady gave me a Multi-Code gate opener. I have no instructions on how to program it. Inside there are 10 switches. My gate code is 5-5-7-2 does anyone have any idea how to program it to work?
Here is everything it says on the back:
HSX-XMULTI-CODE
308911 9949 300
216447C
MULTI-CODE by Linear
Image taken on 2007-03-13 23:41:45 by alexkess.
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December 17th, 2009 01:11
I can help you however, I need you to let me know the make and model number.
December 17th, 2009 00:12
No idea, you may want to call your landlady and tell her you’ve never worked anything like this and need some help.
I would have to, I’m completely unfamiliar with any kind of gates or codes where I live.