How do I manage my files?

Go to 'Present' then 'Files' illustration
1.
Go to 'Present' then 'Files'
Double-touch to open a file illustration
2.
Double-touch to open a file
Single-touch to select for copy, cut, paste or delete functions illustration
3.
Single-touch to select for copy, cut, paste or delete functions
Select multiple folders / Add a folder illustration
4.
Select multiple folders / Add a folder