Click "User Management" on the left hand side of the screen.
You then click the drop down option of "Profiles".
Once profiles is open ,below "actions" you will see "Filters" with 5 selections in blue. You will pick "Team".
In the drop in the "Team" filter, pick the team you want from the options.
To the left you will see "Show entries", you will able to change this with various options up 250.
In "Actions" you will click "Select All".
Once you have have all entries selected , the green tick will appear.
Once again you will click "Actions".
In the drop down , select "Bulk Edit Selection"
Once selected , you will be brought the section called "Field"
This is where will chose the team in the drop down to move too.