EDSTART

This will let you edit either the S:Startup-sequence or the S:User-startup
without typing anything in! Just double click on the Edstart
icon and you'll be asked for the name of a text editor which you
like to use! Choose one and then you won't be asked again unless
you click on the Reset_Text_Ed icon. 

A Requester will then appear asking which startup you want to edit!
Click on one and then it will load into your chosen word processor.
Simple as that!