Hi Chandrika,
You will need to be an Owner of the Team, but you can follow this:
Create a channel on the go
Create a channel
Go to the team you want and tap More options (...) > Manage channels > Add channel (+).
Type a name and description.
- Choose a Privacy level:
Standard - If you create a Standard channel, anyone in the team will see it.
Private - With a Private channel, only people you add will see it.
Tap Done.
If this is helpful please accept answer.