@bhaugen @yunohost @_elena @writefreely @ajsadauskas@blog.sadauskas.id.au It looks like there's two places in the settings that you need to change.
First, in the top right menu, go to customize, make sure publicity is set to unlisted, and then go to Updates and make sure the Federation checkbox is switched on.
Once you're in customize, if you have admin access, go to the WriteFreely menu at the top right, select Admin Dashboard, and then Settings. (If you're on WriteAs, this menu might not be visible?)
On this page, there's a checkbox marked Federation. Make sure it's on, and click save settings.
The other thing you can try is go to one of your blog posts. Click on the date, so it's just that blog post. Copy the URL and paste it into Mastodon and see if it appears.