You can easily retrieve this menu of commands on your phone at any time. Just send an SMS with the message "help".
This is how your friend will receive the message
Function
SMS Command
Sign in
in [Yahoo! ID] [password]
Sign out
out
Send message
to [Yahoo! ID] [message] to [friend code] [message]
View online friends
get
View all friends
get all
Show continuation of friend list (if list is longer than 160 characters and gets truncated)
more
Add friend
add [Yahoo! ID]
Delete friend
del [Yahoo! ID]
Ignore a user
ignore
* Note: the instructions within "[ "and" ]" denote user input. Reminder : To send a Command from your Mobile phone, you need to send it to 58242.
When you are responding to messages from a PC to your Mobile, you should choose the Reply option from your Mobile phone, as you do in regular SMS.
SIGN IN DIRECTLY & COMMUNICATE TO YOUR FRIENDS
