You can edit file /modules/mod_ot_k2slideshow/tmpl/default.php and find the code: Part of the message is hidden for the guests. Please log in or register to see it.
then change the autoPlay value to 1. Save it and try.
If you need to send us FTP access / host access, administrator access or any private information:
services(at)omegatheme(dot)com or drop a ticket www.omegatheme.com/member/