If you are a public ecosystem - simply send them to your ecosystem homepage and tell them to click the Join button.
If you are a private ecosystem or do not have a featured join button, then generate and invite link using the steps below and share that link with the people you are inviting.
1. From your Admin Dashboard click the Doers tile in the Engage section
2. On the next screen click the button to copy the activation code invite link
3. Share the link with the people you want to invite to join. Once they have clicked the link and accepted the invite you will see them in the members list.