If you are using content type
Go to Site Settings
Click on : Site Content Types
Select Your group, from Show Group.
Now you will able to see all content types..
Click on content type which you want to change
You can find: Column order : Click " Column order "
You will see all columns with sort order
You can change sort order..
Save
If you are using Column from List
Go to List
List Settings
Under "Views"
Click on Your view which you want to change the column order
You will see all columns with sort order.
Change order and Save
