pls help me

Dear sir
Im Rev Narangoda sumanasiri live in giriulla .Few years I study dish and recivers as hobby.Now I have Sat xtream s18 open box and I watch Intelsat 12 (Dialog Tv) and utelsat 70b.
And I have buy 6feet offset ku band dish which abonded Nenasala.I want catch the signal of apstar 7 (76.5).but I cant still.Mr waruna said which prepair ku band lnb for this dish.(see below photo).My first dish alingment expirence with 6 feet offset dish.
dish informations.: diameter 6 feet
dish depth 16 cm
hight of lnb arm 120 cm
pls kind advice me how to install this dish for apstar7 and tecnical support.
bs.

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