How do i add minutes to Verizon Glyde?

I have a Verizon Samsung glyde U940 I just bought from someone.I was just wondering how does this phone work and how to add a plan or activate the phone.Im not really sure where the phone came from if he had a plan for it or something.
Can someone plz tell me how this phone works or what do i have to do to use it to text or talk.
What if he had a plan already?
 
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