Hi @migsabarintosjr,
Thank you for your post! It may not be possible to add a Jr after creating the account, since that could be viewed as a transfer of ownership of the account, which is not allowed. You can submit a name change and ask that the Jr. be added to your name, however, and see if they'll be able to add it. It would be added after the last name.
I hope this helps!
Olivia
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