To be able to start with joining a PAMM Money Managers fund and invest in it, you will first have to create an Investor Account from your ProsperityFX account.
Step by Step Guide:
Click "My Accounts"
Choose "ProsperityFX MT4_PAMM Investor" as the Account Type
Choose the "Currency"
Confirm the age requirement and accept the Terms and Conditions
Click "Create Account"
The Account will now appear in the "My Accounts" section of your account.