remove and reinstall program in arduino nano ?

Projects Programming
1

hi
I build a motion sensor with arduino nano but this is a problem . I want remove program and reinstall again . how I do work this ?

2

Just upload the new program to the Nano and the existing program will be overwritten or do you mean you want to reinstall the IDE ?

3

upload new program , will replace in old program ?
thank you

4

upload new program , will replace in old program ?

Yes. What else did you think it might do ?

5

nothing , ok very thanks