Goq you’ve been here for too long not to know this but I will answer it anyway.
Go to
http://www.theyeshivaworld.com/coffeeroom/profile/xxxxxx
replace xxxx with required name and any spaces in the name with “-“
This is assuming they have not changed their username since joining otherwise you will not find it. EG Goq yours is
http://www.theyeshivaworld.com/coffeeroom/profile/thegoq
with no space between ‘the’ and ‘goq’ as that is how you joined, otherwise it would be
http://www.theyeshivaworld.com/coffeeroom/profile/the-goq
as it appears now