|You are not explaining your problem very clearly. |
First of all, tell us that you are working with WordPress - this is far more relevant than that you are using a LAMP setup.
Secondly, tell us what changes you made to those tables (did you change the metadata or just update the data in some fields? In either case, what exactly were the changes that you made? And what results were you expecting?). Why change the database directly rather than using the Administration panel?
Thirdly, what changes did you make to wp-config.php, and what were you trying to achieve?
With a clear statement of the situation, what the problem is, and what you are seeking to achieve it might be possible to give some advice.