How do I return a red cell if N or S is entered?

[Secant]

In cell F13, I want to be able to enter the capital letter N or S. If any other entry apart from N or S is entered, I want the same cell, F13, to return as a red cell.....How do I do this?

 

[Bob Phillips]

Use conditional formatting, and test for that value.

 

[Secant]

Bob, thanks for your reply....your reply didn't answer my question completely as I was left wondering what to do after I got into the conditional formatting part, which, through trial and error, and guessing, eventually led me to what I wanted to achieve....
Thanks for your reply.

 

[Bob Phillips]

I didn't intend to answer your question completely, My aim was to point you n the right direction, but to get you to learn how to use this function.

 

[Secant]

Bob, I acknowledge your help....Thank you for replying to me.