Ok, now when I try to add a redirection it says the following:

Redirecting / to http://animeshadows.com/phpBB3 will cause a redirection loop because '/'
which is located at /home/hickado/public_html/
is above 'http://animeshadows.com/phpBB3'
which is located at /home/hickado/public_html/phpBB3

whats up with that? I tried everything to fix this problem.

This is quite strange. I redirect from ~/public_html to ~/public_html/folder all the time with no problems. If you want, here is an .htaccess file of mine that I use to redirect to a higher directory without a single problem:

Just replace my site with your site. Hopefully that will work well.

I think what it is actually attempting is the following:

• Take any requests to any pages in / -- this includes your forum directory
• Forward those requests to the forum directory
• As the forum directory is in / we need to forward them to the forum directory

It then repeats the last 2 steps for ever, as it is constantly forwarding itself to a page that needs forwarding again. Try setting the forwarding to go from /index.htm to /phpBB3/index.php. Regardless of whether index.htm exists, anyone who types your address in will automatically look for it, and get forwarded.

If that doesn't work, Tetraca's idea is also perfectly valid, just a different way of doing things.