as dangerous says you wont get any premium servers free say for example for sky uk but you can pay for whats called a c line ,a c line is a line of info which contains port numbers /usernames /passwords etc ,here is an example of what a c line might look like (this is just an example c line and does not work ) C: techkings.dyndns.org 12000 user1111 share1111 .
you have to put a c line into your box and in order to do that you need to connect the dm500s to your broadband router (you need an ethernet cable or some kind of wireless device such as homeplugs ) then you install a cam such as cccam (you put a c line into cccam and then the channels should open ) you need a bit of software called dream control center which you use to connect to the box.
dream control center needs a little setting up but its quite easy ,then you can connect to your dreambox and put the c line into a file called cccam.cfg . i realise this may all sound complicated but it is easier than it sounds ,but a little patience and a little pc experience is all thats needed .
one problem you may have is that your box may not have an image on it or the image may not be suitable (an image is the name for the tv software ) in which case the box will have to be flashed (flashing means putting the tv software into the box ) you need atleast a null modem cable and a bit of software called dreamup to flash the box and of course you need a suitable image .
when the box arrives connect it to the tv and to your satellite dish and plug it in ,when the box starts up look at the tv screen and if its got an image the name of the image should be displayed on the tv screen such as the GP (gemini project ) ,nabilosat ,dreamelite ,pli etc .if the box has a suitable image it wont need to be flashed again and then all you will need is to connect it to your router and install cccam ,then download dream control center and use it to put the c line into the box .
you can download dreamup /dream control center etc from the link in my signature area , if you have any questions just ask and ill do my best to answer them . you will have to buy a c line (they are not free ) they cost about £115 a year say for sky as opposed to paying sky about £700 .