JRP activation & seat reservation precedure enquiry

Hello,
I am traveling in a small group and we would like to know:
*if JRP activation must be done personally by each traveling individual over the counter, or if we can send someone -with all our passports- to do it for us (without us being present at the counter at the moment of activation) **if (once we all have our JRP activated) we can send someone to reserve all our seats, or if this procedure must be done personally by each traveling individual Thank you for your time,
Francisca.