how to finish the planning test ?

[flydragon2018]

I have followed the instructions:
$ roslaunch rrt_planner global_planner.launch test:=true
$ python3 src/rrt_planner/script/rrt_planner_test.py --planner

now, I am stuck on here:

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Open Map [stage_1][ INFO] [1688117531.975530249]: Loading map from image "./src/rrt_planner/maps/stage_1/map.pgm"
[ INFO] [1688117531.976247768]: Read a 97 X 97 map @ 0.050 m/cell
Done.
Preparing Global Service Client ... Done.

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Given-Start-Goal Path

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Click start point:

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I clicked and input several x,y values, don't know how to keep going.

how to input start point and end point? to finish the planning.

Please give detailed example.