Hi, Tolik Petrov
If you want to remove any of your content from the Mindstick portal, you can directly request from the Mindstick Admin department through their ContactUs page.
By the way, if you post any content on the portal of Mindstick, you can edit, update and delete it at any time within the next three days. But after three days this facility automatically turns off.
I hope that you will be satisfied with the information given by me, Thank you......!!!