If you want to change the LNB frequency in your set-top box then it is very easy. For this, press the MENU button from your remote, then you go to the installation.
Remember this -
MENU >> INSTALLATION >> SATELLITE SETTINGS
MENU >> INSTALLATION >> SATELLITE SETTINGS >> ANTENNA SETUP
From here you select Universal LNB for KU-BAND LNB
UNIVERSAL AND LNB FREQUENCY DETAILS
09750 / 10600
If you want to enter LNB frequency for C-BAND then
Select STANDARD LNB for C-Band and type or enter LNB frequency.
05150
However, you will get satellite signals of DD Freedish only through KU-BAND.
How to CHANGE LNB FREQUENCY? This question was asked by Sandeep ji in this post.