BlogoText/addons/

Your addons must be placed in this folder.

Where to find the addons?

Take a look at :

https://github.com/BlogoText/blogotext-addons

And ?

Download the addons that suits you
Place them in the addons folder of your BlogoText
Go to the admin interface of your BlogoText ;)
http://-your blog URL-/admin/addons.php