How do I create sub-account users?

I can have 3 other users on our account. How do I invite them?

What I would suggest is to check out this guide: How to Share Forms with a Sub-Account User

It will guide you through all steps - from creating a sub account user to sharing the forms with them.

I also see that you have opened one more thread in regards to the same question, which I have removed now for you since you should have only one thread per question / issue - allowing us to better assist you and you to find the relevant info more easier at a later date.

If you have any further questions however do let us know and we would be happy to assist you with them.