I did it manually, I do not know how to create or even run a code or a bot to make automatized things, In a new future I might try spend a time studying how to do thins kind of things couse I think it is a useful knowledge to ones life.

But in the specific case of welcoming introducemyself post I rather to do it manually, I have already made a lot a friends because I have spending a time, even small, with their posts, and realized that we had a lot in comum. I'm not saying that a bot who send automatized messages to then should be forbidden, just that I rather to be in touch with the new ones in this amazing community ^^/