If your using DiSEqC 1.2 you will have to set-up the dish positions manually. If your usuing USALS it should be automatic.

Here's the USALS procedure from memory (someone please jump in and correct me if I've made any mistakes)

First make sure the dish is correctly aligned on a satellite, eg THOR 1W

Press Menu -> Set Up -> Service Searching -> Tuner Configuration

Choose Tuner
ALPS BSBE2 (DVB-S2) - Press OK

Configuration Mode: Advanced

Satellite : THOR 1W

Voltage Mode: Polarization

Tone Mode: band

LNB : LNB 1

DiSEqC Mode: 1.2

Use USALS for this Sat: Yes

Longitude: Set this to the correct Longitude for your area.
To find the correct longitude settings for your area go to the following website
http://www.multimap.com/

In the "Find a Map" box at the top left of the page, enter your post code.
Select your country in the drop down box below it and click on the "Find" button.

This will display a map on the screen and below the map at the bottom right you
will see your Latitude information, example below for Post Code NW1 UK :-

Lat: 51:31:59N (51.53319)
Lon: 040W (-0.1445)

So in this example in the Dreambox menu you'd set

Longitude: 51.533
West