When the first period is over you can paus the period by pressing on the centre-button.
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The game is now in paus/break. When you want to continue press New Period/Ny halvlek. If you want to go back to the first period and keep that period going, you may instead click Continue/Fortsätt.

If you by mistake have changed period, you should know that it is not possible to switch back. Just carry on with the reporting as usual.

Second period is now in action.