I don't know how but it (probabbly by my mistake) disappeared xD My forum address was like this https://help.forumotion.com/forum ( forumotion is just taken for example) but now it looks like this https://help.forumotion.com how do I back that /forum? I need it back for loading page before accessing forum.

p.s
sry if it's not in the right place

Please post your forum's link.

Make sure to install your portal. Go to ACP > Modules > Portal Management > Install portal.
or
Make sure that your HTML page is already set as default homepage.

fixed