Unfortunately we only have English support on the forum, however you can find Spanish support by emailing email@example.com, or firstname.lastname@example.org!
We also have our entire site translated into Spanish at Oberlo.es!
In regards to your question, you can show your customers the shipping price by setting it up in Shopify. Here is the steps to do so. Although it is in English, I would suggest translating it into Spanish to get a basic idea. For further questions, I would suggest reaching out to the two emails I listed above! All the best.