Comment 1 for bug 1223828

If I remember correctly, deleting is not possible when you have device detection turned on. We limited some functionality for small devices.

It works when device detection is turned off (see http://manual.mahara.org/en/1.7/administration/config_site.html#user-settings #9 for allowing this feature on the site level and then you can turn off device detection in your account settings).

Do you pretty much want to be able to do all the things that you want to do on a computer in terms of editing and deleting content?