The following are the steps to use the VI editor

Open Terminal in Linux
Navigate to the folder where you kept your programs using cd command
Type the following command but Replace FILENAME with the name of your shell program Filename
```
  vi FILENAME.sh 
```
Press i to start editing the File
Once you are done editing the file Press the Esc button on your keyboard
Type
```
  :wq 
```
and press Enter