Require information on SIM toolkit

hi all,

I am Kavit Gamot i want some information on Programing of SIM toolkit

If i open inbox in Message then there is three option
1st option
2nd read and
3rd back

now if i want to add 1 option in ” OPTION ” then how can i add it?

for example…
when i click on option it shows delete , reply and forward.
now i want to add edit option then how can i add it?

for add a option i have to use SIM toolkit?

how can i programe for SIM?