You may mark a Goal as complete and later realise that there is still more work to do, or you may have accidentally marked it as complete. Either way, to make the Goal active again;

Step 1 – Select the Goals Tab at the bottom of the screen. This will then show you your current active Goals.
Step 2 – Press the completed Tab at the top right of the screen to view any completed Goals that you have.
Step 3 – Click on the Goal you want to reactivate

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Step 4 – Either un-tick the box or

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Click on the Goal and then click to make it Active

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The Goal will now move to the Active Tab.