The word almacenad is the imperative form of almacenar in the second person plural.
See the full almacenar conjugation


Almacenad vuestras gracias en el Cielo donde no perecerán, ya que todo lo que tenéis sobre la tierra solamente se os ha prestado para vuestra existencia terrenal.
Store your graces in Heaven where they shall not perish, for all you have on earth is only loaned to you during your earth existence.
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