procedure to port a number into Lebara with friend's referral

Hello there!
I am referring a friend to Lebara, and I sent them the link.
they want to join Lebara, using my referral link, moving to Lebara their existing phone number.

What do they need to do first?
Do they need to use the link to select the plan they want? They tried doing this, but they get to the payment page before they are asked about moving their existing number to Lebara.. will they be asked about that after the payment?

or do they need to order a Free Sim first, and then ask for the porting of the existing number? In that case, how do they let Lebara know about the fact that they have been referred?

Thanks!

UtilUtil

You must order your new Lebara SIM first.
Then when you receive SIM you request pac code from current provider.

Thanks!