Something

block load
{
es_xsetinfo firstmenu 0
es_keygroupdelete rankmenu
es_keygroupcreate rankmenu
es_format firstmenu "Reset your rank?\n1. Yes\n2. No"

}

event player_say
{
  if (event_var(text) equalto "!resetrank") do
  {
    es_menu 20 event_var(userid) server_var(firstmenu)
    es_keycreate rankmenu event_var(es_steamid) 
    es_keycreate rankmenu event_var(es_steamid) inmenu
    es_keysetvalue rankmenu event_var(es_steamid) inmenu 1
  }
}

event es_client_command
{
  if (event_var(command) == "menuselect") do
  {
    es_setinfo inrankmenu 0
    es_keygetvalue inrankmenu rankmenu event_var(es_steamid) inmenu
    if (server_var(inrankmenu) equalto 1) do
    {
      if (2 in event_var(commandstring)) do
      {
        es_keysetvalue rankmenu event_var(es_steamid) inmenu 0
      }
      if (1 in event_var(commandstring)) do
      {
        es ma_resetrank event_var(es_steamid)
        es_tell event_var(userid) #green event_var(es_username) your rank is now reset... 
        es_keysetvalue rankmenu event_var(es_steamid) inmenu 0
      }
    }
  }
}

event es_client_command
{
  if (event_var(command) == "menuselect") do
  {
    if (2 in event_var(commandstring)) do
    {
      // nothing
    }
    if (1 in event_var(commandstring)) do
    {
      es ma_resetrank event_var(es_steamid)
      es_tell event_var(userid) #green event_var(es_username) your rank is now reset... 
    }
  }
}