Self-registration team is created based on Individual price type.  You can add self-registration teams to a new or existing price type.  Below are the instructions to setup self-registration team price types in Registration Categories (Step 3) of event set up 

Create New Self-Registration Team
  1. Click Add a price under the desired Category
    • Note: Registration categories are required before price types can be added
  2. Select Individual for Price type
  3. Enter Display name and Price User-added image
  4. Check Allow self-registration teams
  5. Click Save
Allow Self-Registration Team for Existing Individual Price Types
  1. Click Edit next to Individual price types
  2. Check Allow self-registration teams
  3. Click Save