XF 1.2 Please help MySQL prepare error

Please guys I am looking for help.... I just signed onto my site trying to post a message and I get the following error

How do I fix this?



Well-known member
Using phpMyAdmin you can try repairing the xf_search_index table. If repairing does not work, empty the xf_session_index table (truncate).
Andy please forgive me as I am not extremely knoweldgable in reparing tables.

I am in phpmyadmin and I see the xf_search_index table .... please guide me through on reparing the table.