If you have a created a Lead and named it, then decided that you didn't want it any more or maybe it was the wrong information that was added in. You can either edit it or delete it if you wish. All you have to do is go to 'Leads and Sales' and click on the chosen Leads to edit. 

Once you have selected the Lead that you want to edit or delete, make the changes and click the appropriate button. ' Save' or 'Delete'.