Android Question mysql remote delete

Hi srs
Connection php file is the one who put in their tutorial Erel

This code works, insert, select very good no problem

Query="SELECT Nombre,Tiempo FROM Brain ORDER BY Tiempo ASC"
req.InitializePost2("http://kahapdos.com/mapas.php", Query.GetBytes("UTF8"))
hc.Execute(req, 1)

but this code does not work, no delete and no update

Query="DELETE FROM Brain WHERE Nombre=wolf4"
req.InitializePost2("http://kahapdos.com/mapas.php", Query.GetBytes("UTF8"))
hc.Execute(req, 1)

the difference is only the sql statement.
could you help please.?

It is the only thing to complete my project