How can I change extruder feed rate when loading new filament?

I have installed a 0.2mm nozzle onto a Wanhao i3 plus, using flexible filament the feed rate using Load & Unload function is to fast causing the filament to jam just after the extruder. The machine has been flashed with the following.
ADVi3++LCD: 3.0.1
ADVi3++Mainboard: 3.0.1
LCD Firmware: 2.2
Marlin Firmware: 1.1.8

Any assistance would be greatly appreciated.

You can’t without modifying yourself the source code and recompile.

Ok, thanks for your prompt reply.