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in my forum this is the link for the homepage, when you click that button: https://greek-hosting.tk/forum/index.php?p=/, however it redirects me to a completely other page non-related with the forums.
How can I fix that? Please help me.
That looks like you do not have pretty urls working properly.
Thank you for the article @whu606. It really helped, what I had to do is put this: $Configuration['Garden']['RewriteUrls'] = true; in my config.php file.
$Configuration['Garden']['RewriteUrls'] = true;