To start a team match is easy, but some could find it somewhat difficult.
Luckily, in BBO there's an easy tutorial:
https://blog.bridgebase.com/2020/05/01/setting-up-team-matches-on-bbo/
Remember to write the title of the match, Tonci Radelja Memorial ICL
When setting up a team match, you have the option to add the following codes to your match description for a more tailored and seamless gaming experience. We recommend that you use these codes:
+nokill+ This setting ensures your team match remains pending until all seats are filled.
+slow+ The match will not automatically time out if it takes an extended period to complete.
+silentspecs+ This option blocks kibitzer chat, allowing kibitzers to only converse privately with each other.
+private+ Prevents players from requesting permission to fill empty seats. This is especially handy when you want to start the match with empty seats and send out invitations without interruptions from unknown players.
When you need use multiple codes, simply list them one after another, as shown below:
+private+ +nokill+ +slow+ +silentspecs+
Fill all the seats before to launch the Team Match; in theory it's possible to start the match and after fill some places, but the place should be blocked before, and woe to us if whe forget to block it! All BBO will try to enter the place we have left unguarded.