You must go to "MySQL Workbench" and open the database in there. I have installed it for you in the server. There is a database "a3wasteland" and a table inside it called "playerinfo".
There you can edit the field and put any amount you need in it. See my character in the "playerinfo", I put 20000000 in my ATM. Also, after altering the value, don't forget to press "Apply" to save it to the table.
Be careful when you mess in that database because if you alter the wrong things, you need to rebuild the entire database and the mission breaks completely and must be reset from scratch again.