Automatically activate macro when data is inputed instead of manually activating macro

I have a spreadsheet(tool.xls) I have created for my associates which helps them to send emails to different managers in the cities.

all they do is input the different ID# into column B and then click the command button "run" which activates macro "deter" that transposes the emails with a ";" into cell "output"

I am trying to eliminate the need to use the "run" command and directly activate the macro as soon as the user inputs data into the column B which will automatically transposes the addresses with the ";"

I am just trying to figure out if there is a way to do this with vba code in the existing macro or use a macro to activate another macro??