recording pop up - DirecTV DVR

For recording pop up, relating to DirecTV DVRs and receivers. We recently purchased the R15 and are using only one tuner at this time. When we have a series link setup, 5 minutes prior to the start time of the program a pop up appears in the right hand corner signaling us to change the channel. When we confirm, it changes the channel immediately. Can we modify the "change time" so we can finish watching the current program?
In addition, we have the R15 hooked up to a Westinghouse TV and there is only one remote control code for Westinghouse for us to try and it does not work (for us to utilize the Directv remote with our TV) - Any suggestions?