Following is as easy as pasting @gilles@blog.gillesdutilh.com in you mastodon search field, and clicking follow. You can also click follow below.
Gilles Dutilh
18 posts
8 followers
Sharing, favoriting and commenting can be done by copying the url (Ctrl-l Ctrl-c) of a post to the search field in mastodon (or whatever Fedi platform you’re on), pressing enter, and interacting as you would do with any other post.