How do I add contacts to a newly created team?

hi, I am a beginner. I created a "Team" but cannot add any contacts. In addition I cannot chat with anyone. Looking for help.

אפשר לענות לי בעברית

update: I followed the instructions at https://docs.microsoft.com/en-us/microsoftteams/guest-access-checklist

https://docs.microsoft.com/en-us/microsoftteams/guest-access-checklist

Thanks in advance,

Racheli

Israel