You need to set a default jog feedrate in the startup block. That is what the message refers.
In the window above the Do Cmd. button, type in $N1=FXX and select the Do Cmd. XX is your desired jog feedrate and it will load that every time PicSender connects. To change the jog feedrate after connecting to the com port, use the FX drop down menu to change the jog feedrate you want, then select the FX button.
We also set to inch units with a $N0=G20 startup block. $N0=G21 is for Metric. Execute it the same way with the Do Cmd.