@mykl Right now I think that I'll leave the ActivityPub for now.
Is easier just to make an account in lemmy.ca and in kbin.social than trying to reply comments/toots, find a way make the comment in first place, to try to follow someone and also to find a way to save content from another social network.
Also ActivityPub allows me to make a post on Lemmy from Mastodon on any of their "subreddits/communities".
The issue I can only post and reply 500 characters. Which is very annoying.