Click on "Get Codes (FANBOX)" or "Get Codes (PAYHIP)". It will take you to Fanbox (for JPY) or Payhip (for USD) where you can choose between three tiers that will grant you access to subscriber content.
IMPORTANT!: You will want to subscribe to the "Father Tier" or "Family Tier" to get access to the "P-Edition" art since the Father Tier password key is the same as the one used to access the Pedo Tier art!
Once you found the key code for the Father Tier, click on the "Insert Pedo Tier Codes" button to insert the key.
And voilà! You successfully subscribed!
Click here for a more in-depth tutorial!
Son Tier = Base art. No shota art or pedo art.
Family Tier or Father Tier = Base art plus shota & pedo art.