1- Look for the activity you want to reopen

From the "Activities" menu, in your Klaxoon account, you will just have to search for the Activity you want to reopen.

Then, you can click on the 3 dots to the right of the Activity, then move your mouse cursor to "Manage Activity" and finally select the "Reopen" option

2 - Confirm the reopening of the Activity

That's it, your activity is now available