There are two ways to mark a Goal as complete.

The Quick Way

Step 1 – Display the Goal list with the Goal that you want to mark as complete. 

Step 2 – Click in the circle on the right hand side of the Goal box.

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The Long Way

Step 1 – Select the Goal you want to mark as complete
Step 2 – Scroll down to the Goal Status Field

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Step 3 – Press Completed to change the status.
Step 4 – Select the  < Arrow at the top to save
Step 5 – Reward yourself for completing a Goal successfully.