Install phpBB SEO
1> Backup all your files;
2> Download phpbbseo :
http://www.phpbb-seo.com/boards/advanced-seo-url/advanced-phpbb3-seo-url-vt1219.html
3> extract

[phpBBc@titik www]$ unzip adv_phpbb3_mod_rewriteV0-4-0.zip
[phpBBc@titik www]$ cd root/
[phpBBc@titik www]$ mv phpbb_seo ../

4> CHMOD the phpbb_seo/cache/ folder to 0777;

[phpBBc@titik www]$ chmod 777 phpbb_seo/cache/

5> Empty the phpBB/cache/ folder : just delete all files EXCEPTS the .htaccess.

[phpBBc@titik www]$ rm -f cache/*.*

6> Copy Files

[phpBBc@titik www]$ cd contrib/phpBB_3.0.0_modified_files/root/
[phpBBc@titik www]$ cp -R ../../../
[phpBBc@titik www]$ cp ./root/language/en/acp/phpbb_seo.php ./language/en/acp
[phpBBc@titik www]$ cp ./root/includes/acp/info/acp_phpbb_seo.php ./includes/acp/info/
[phpBBc@titik www]$ cp ./root/includes/acp/acp_phpbb_seo.php ./includes/acp/

7> Go to www.yoursite.com/phpBB/phpbb_seo/phpbb_seo_install.php and follow the install instruction
8> Go to phpBB ACP : It’s now time to play with settings described bellow;
9> Generate your personalized .htaccess and upload or move it following the instructions;