no text display option in my script,

this is my first day start using Unity. I write basic timecount down script, and after I drag and drop my c# into empty GameObject. It show I have the script, which is good, but I cannot see the text display option inside the script session. picture shown below:

In this case, I drop my Text(Legacy) to empty_GameObject but still does not allow me to have text display option in script. Any help would appricate.,

Field will show if they have a “Public” Keyword before the var

Example:
`

public text textDisplay;
`

If you need more assistance you can post your script as well