Can "Can you, please, help me" be followed by "as to which"?
The phrase "as to which" is somewhat formal and "dated" (this NGram shows that it's being used less and less). In keeping with that observation, assuming OP stills want to use the phrase, a better way to put it would be...
Can you please enlighten me as to which button...
Note that although the commas aren't exactly incorrect, they're certainly superfluous even with starchy phrasing such as this. A more modern/informal way of asking the question could be, for example...
Can you please tell me which button...