[amsat-bb] HRD transponder setup help?

I'm totally bemused and confused by this. I can't control my up and downlinks (happens to be on on VO-52) with my HRD setup/ IC-910H. It's in sat mode.

I set the centre frequencies in the tx box to 435.250 and rx box for 145.900 and tick the transponder box, and tune manually, but can't hear myself coming back on cw and can't find the sig using the RIT function (+/- 1 KHz).

So keeping the transponder box ticked, I tick the vfo tx to 435.226 and rx to 145.924, can't hear myself, no change with rit, and HRD say I have a 24kHz RX off set. if I click the up icon the vfo freqs change to the freqs set in the transponder box.

There must be something very simple I'm doing wrong here!! Grateful for any support.

73 de andy g0sfj