Welcome to the forums!
For all the SQL operations you should use executeSQLQuery as you have already noticed. There are many examples in the wiki page which you could use.
I will show you an example how your first executeSQLUpdate will be with executeSQLQuery.
executeSQLQuery("UPDATE stats SET cash=?, dms=?, wins=?, owner=?, skill=?, pts=? WHERE player=?", statsCash[playerName], statsDms[playerName], statsWins[playerName], statsOwner[playerName], statsSpts[playerName], statsPts[playerName], playerName)
I guess now you know how to make the other ones.
Don't hesitate to ask if there is a problem!