How to have two account Please read

I have two cell phone with two email account one is the work is listed as ***@*** / the other is my other account ***@*** / the first one is for a phone from a employee that is not here any more don't know his pass word trying to set up the two phones by them self , can you help / phone number for one is ***** the other is ******/ please email what to do Thank You Mack Brown