How???

Shit, I’ve been trying to figure that out myself. However I believe you just type in the @ at the end of someone’s name. Like mine would be @sobo275 (I believe)

Okay this is what you have to do, you need to validate tour phone number but it only works of you have an American number. If you don't, then use this sms site, use the American number and validate the number, you'll get a message on this site which will give your validation code. Once you've validated, you can reply to people and you don't have to do the Annoying CAPTCHA. This is the site: https://receive-smss.com/

i had trouble with this too, but I think its something that's auto enabled when youv made so many posts cant confirm though, been ages