Hi troll89, first of all welcome to x10hosting.
i noticed your forum is working excepts it takes awhile to load and some broken images.
if you noticed the error logs shows alot of file not found errors, try looking through each individual one of them.
when uploading MyBB, did you upload all required files? because not only images are missing but some which might be required e.g task.php and .js files as per error logs
also there are some missing files in your public_html folder - 1 of which is .htaccess
did you add anything in .htaccess file before? if not you can recreate a new .htaccess file with below content - only replace yourcpanelusername with your own.