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Ok I did it thanks, there is 1 more question I have : which address should I paste there : "spending", "smart rewards" or "smart rewards 2" ? Thanks a lot in advance ! I guess it's either "smart rewards" or "smart rewards 2", the one I prefer, maybe it doesn't matter :D

You can click the red "edit" buttons next to the wallet names and rename them any way you want. You just need to make sure the one check-box is checked with "IS REWARDS" so you can earn smart rewards on any wallet. So you can post one of the Rewards wallets on our newest video posts. Also, the name you login with is an address and when people send to your username the funds will go to your #1 wallet (spending right now)

ok thanks a lot for this useful piece of information !