To delete a bot, you should click the Delete icon on the Bots menu in the Actions column of the Output table of all bots.
Make sure the bot is off before you delete it. It is not allowed to delete a running bot. This so as to avoid any accidental deletion of running bots.
Make sure that the bot does not have an active cycle before deleting it. It is forbidden to delete a bot with an active cycle. This is to avoid an accidental deletion of bots that have not completed their active cycles. If the bot that you want to delete has an active cycle, mark it as cancelled. The button "Mark the last cycle as cancelled" can be found in the menu of statistics and control of a particular bot, you can click on it by the bot name in the list of all bots of the Statistics menu.