How does it work?
You just leave a comment here, describing the type of service you look for or offer. Your potential peers will surf through the comments and hopefully contact you.
Why it is not permitted anymore to offer (or ask for) such services in separate posts within the community?
Because this community is primarily educational, and its members grow tired of monotonous chat-offering posts that pollute it, and voted to introduce this new rule.
What if I still want to leave a separate post offering my [best in the world] real-time communication service in the community?
Unfortunately, your post will be deleted soon.
What if I post the same stuff again?
Unfortunately, your further participation in this community will be terminated.
Thanks for understanding. Find good peers! As a secondary option, you may want to visit a community entirely dedicated to communication exchange: languagebuddies.