Add new column to the DB

i have already created the .sql file with the following code {
ALTER TABLE ip_invoices
ADD invoice_type_id TINYINT(2) NOT NULL DEFAULT ‘1’
AFTER client_id ;
}
but i need to run the Query to add the COLUMN to the DB ! . is there a Parameter i need to run in the URL or how should i do it ? or i can only add the Column from phpmyadmin directly

i’m using v1.5.10.

Thank you All!!