Jessica gave me a 101 express course on How to Share Documents on Blogger and I followed every step and voilá, the link works!
Now, and I am just guessing here, I think I am not the only one who did not know how to to this, so just in case, I will share with you what Jessica shared with me:
You can do that using Google Documents:
Log in to your Google account, click on "documents" (or go to docs.google.com and log in).
Click on the upload icon (on the left next to "create") and upload your PDF.
Choose you setting (I leave both boxes unchecked).
This will bring you back to the homepage and you will see your PDF.
Check the box next to it and click "share".
Under "who has access" click "change and choose your settings, either "public" or "anyone who has the link".
Choose "save" and then Google will provide you with the link to use on your blog.
Jessalyn and Lumbrera suggested I should use Scribid; so that will be my next challenge :) The instructions on how to do that are here (or here if you rather read them in Spanish).
So, my friends, enjoy this pretty bookplate brought to you by my beautiful friends! (And now that I know this art of sharing, I will have to ask Christina to make more pretty things for you!)
Valley of Vision Bookplate