In reply to Dani.

When I search @danicotillas@comunicacionabierta.net on Mastodon I get a 503 remote SSL certificate error. Maybe something wrong related to your hosting there?

For the first method I mentioned, it's just the two plugins ActivityPub and NodeInfo and your posts show up in the fediverse and the replies come back automatically.

If you use the second method, then it's one of those plugins and appropriately setting up your Brid.gy account.

You can find additional help at chat.indieweb.org if you need it. Perhaps someone there can help in your native language as well?

Neither of these methods should require any .php coding. I'll mention that each method is completely separate from the other, but you can do both methods at the same time if you wish. Do check the documentation on all the plugins (or on Github) if you run into issues as that can often help.