The admin page of Atlassian must be opened first to reach or to give access to the logs. After selecting site of your organization, ‘Connected apps' section of 'Products' setting that is located on the right side of the page is needed to be clicked. There is a list of all apps connected to your site. The manage button next to the issue reminders application provides access to the application's details and authorization section. From 'Details' part disabling/enabling log access and downloading app logs can be made with the buttons 'Disable/Enable log access' and 'Download Logs'.