Dear Experts

I use following commands to save/insert records in access table

public myconnection
myconnection = sqlstringconnect("Driver={Microsoft Access Driver (*.mdb)};Dbq=e:\asoft\db1;Uid=admin;Pwd=")
* db1 is mdb name
sqlexec(myconnection,"select * from table1", 'cursor1')

*To save record
fld1=thisform.text1.value
fld2=thisform.text2.value
fld3=thisform.text3.value
fld4=thisform.text4.value

myinsert="insert into table1 (sno,name,phone,city) values(?fld1,?fld2,?fld3,?fld4)"
&& table1 is table name in db1.mdb

Now I want to edit/update record1, what codes should I use?
The primary key is on sno field.
Please help