Klen

I installed one mod on one script and last step is adding sql but i dont know how to add it,i tried with sql query on phpmyadmin but it reports errors.
Here is info:
Query: [Select]
SHOW COLUMNS FROM {$db_prefix}members LIKE '$column'
Query: [Select]
SHOW COLUMNS FROM {$db_prefix}log_activity LIKE '$column'
Query: [Select]
ALTER TABLE {$db_prefix}log_activity ADD COLUMN $column $spec