Send a massage into a chosen channel

hi their im pretty new to glitch.com and i know the basics. but i whould really like to have a /say command that the bot will send something in a chosen channel could anyone help? (i dont use a prefix at the beginning of my code so that is crap.)

I couldnt understand, is it like
/say hello and send the message to current channel,

/say hello #announcements and it will send it to that channel,

or /say hello and it will send to the channel you specified in your code?

not the 1st one but the 2nd and 3rd, its just what is easyer for?? idk i like 2 the most but i cant say like you have to do it XD.