To add more people to the solution, press your profile next to "Contributors".
2
Then press "Edit", search for the people you're looking for, and click the ones you'd like to add. Note that people need to have registered for this page to be found here.
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You can now close this box.
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If you want to edit the solution you can press the three dot sub menu and click "Edit".
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And to add an attachment, just press to "Add attachment" option below.
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Make sure you have answered everything for your solution before the deadline.