On the side menu, select Campaigns, then select the campaign you no longer need and use the “delete” button.
Then you will be asked to confirm you want to delete your campaign. Make sure you really want to delete the campaign before confirming, as deleted campaigns can not be restored.
Once your campaign is deleted you will see a notification message.
To delete a Skill, select Skills on the side menu and then click on the skill you would live to delete.
At the bottom of the page select Remove Skill and confirm that you would like this skill to be deleted.