[BaziCenter]

To create User Profile Field Go to:
AdminCP -> User Profile Fields -> Add New User Profile Field -> Single-Line Text Box.
example info for XBOX Live Gamertag field:

• Title: XBOX Live Gamertag
• Description: Enter your XBOX Live Gamertag.
• Max length of allowed user input: 25
• Field Length: 25
• Private Field: No
• Field Searchable on Members List: Your choice!
• Show on Members List: Your choice!
• Regular Expression: ^([A-Za-z0-9 ]+)?$
• Which page displays this option? Edit Profile

then go to the "User Profile Field Manager" and see your created field ID in Name Column. (fieldx: x is field ID)

repeat this steps for other platforms as well.