As a guess you want to let the user know when they have entered something
that they shouldn't have. In this case what you want to use is Validation
from

Data - Validation

menu. If that is not what you are looking for then you need to give us more
details and you need to be prepared as Bob refered to "need VBA event code to
do this"

HTH

"aoliveira" wrote:

I want a text box to pop-up when a condition in an "IF" statement is true. I
am using Excell.