when I download the .csv file, see the image how it looks like.

[#1]

How can I delete first three rows and make fourth row as my header ? Please let me know.

[#2 · Accepted solution]

I created following csv

a,b,c
d,e,1

f,g,h,j
2,3,4,5

Then I can open it using Preview

and from the UI I can make changes needed

[#3]

Thanks a lot. This worked.