This is not easy the first time. If the dish is Off a fraction of an inch, you will not get a Lock.
Double check LNB settings in the Sat Setup Page.
You must have a Live / Active Transponder Freq. selected in the Sat Setup Menu - AMC 5: 12181
Then re-check Dish Elevation.(note: Dish Elevation markings are known to be off a few degrees)
If possible, bring the Receiver and a small TV to the Dish.
Then slowly pan the dish Left / Right, if nothing, Raise / Lower Dish Elevation 1deg and pan again.
If you can, get a decent compass, so you can be pointed in the correct direction.