Does your S2828 look like this ?

If so the below should work for prime

To add the new transmissions.

Step 1

Press the Menu button to bring up the main menu
Press the left arrow until the Installation menu is displayed then press OK
Select TP Manager and press OK   *If 12519 is already present select and go to step 2*
Press the down arrow to select one of the Transponder entries
Press the Red key (To add)
Using the number keys enter 12519
Press the down arrow to select the Symbol rate and enter 22500
Press OK to save the transponder details

Step 2

Press the Blue key (To scan)
Press the right arrow to select Free Only and press OK

The receiver will then scan through and locate the new transmissions.

This process will take less than 1 minutes to complete.

Once the scan process is completed the receiver will return to the Transponder list.

Press the Exit button to return to normal viewing.

You will need to organise your channels into the correct order after scanning.