You need to have a minimum of 1 merit to be a Jr. Member here.
Read:
In addition to Activity you now need Merit to achieve each rank. The required merit is detailed below:
Brand new: 0
Newbie: 0
Jr Member: 1
Member: 10
Full Member: 100
Sr. Member: 250
Hero Member: 500
Legendary: 1000
https://bitcointalk.org/index.php?topic=2766177.0