As we know from 1st February 2016 DD Freedish / DD Direct plus has been shifted to New satellite GSAT15 and there are Transponder frequencies to be changed in your Freedish Set to box to get DD freedish channels.
Here is step by step procedure in Images
First Press Menu in your Remote and you will get screen similar to this depending on your boxes softwares, Then go to Setup Program setup / Installation option
Then you can find Add Program option, after pressing OK then you will get option to add transponder and other parameters, just see the screenshot here and add as per it and check signal levels . Here example of frequency 11090 v 29500, you can add similarly 11470 v 29500, 11510 v 29500, 11550 v 29500, 11170 v 29500