This is the 13282nd most frequent Spanish word.
publicarla
"Publicarla" means "to publish it" in English.
The pronoun 'la' refers to 'it', and it is attached to the infinitive verb 'publicar' to form 'publicarla'.
Voy a publicarla en mi blog esta tarde.
I am going to publish it on my blog this afternoon.
Here, 'publícarla' is used in an imperative question, with 'la' indicating the object to publish.
¿Puedes publicarla ahora mismo?
Can you publish it right now?
In this imperative sentence, 'publicarla' indicates the action to be taken with 'la' referring to the item to publish.