Setting up freeview should be quite easy, simply follow the instructions in the user manual to tune for any normal station.
You need to obtain a user manual, simply use Google search, and type in the exact make and model, and the words user manual. Then simply follow the instructions for tuning a Channel.
Freeview is nothing special, it is simply a "Format" but essentially is NO different from any "Other" station, and is tuned exactly the same.
If you use the "Auto Search" function, this will scan all available frequencies and then lock and store them in order on the set, they will then be available, via the channel changing button on the set, or the remote. Again the manual will direct you as to what and how to do it all.
Also you can get a manual direct from the Samsung site link below...
http://www.samsung.com/nz/
Now below is a link for a TV similar to yours, i guess, as you didn't indicate the exact model? However the tuning instructions will no doubt be the same? so download this manual, and have a look to at least get the idea of what to do?
http://www.samsung.com/nz/support/detail/supportPrdDetail.do?menu=SP00&prd_ia_cd=101&prd_mdl_cd=LA52B750U1MXRD&prd_mdl_name=LA52B750U1M&srchword=Series+7+52inch+%28LA52B750%29