How to Change parameter name on screen in SAP ABAP?

I'm trying to replace the parameter name when it is showed in the screen. Any ideas how this is done? For example when I have:

PARAMETERS pa_age TYPE age_type DEFAULT '18'.

It shows pa_age on the screen. I want to change it to How old are you? or something. Any ideas?
Answer:
Via menu Goto->Text Elements->Selection Text.