After placing two PFX certificates on my SD card, I go to
Just found this thread on XDA, should provide the assistance you are looking for: How to install certificate on android? - xda-developers
I followed all the links, read them, installed two certificate installers from the Play Store, but it seems that they install only other kind of certificates and not those I mentioned on my post — PFX. The same one that other people are looking for.
What is the extension of the certificate files?
If so then you will need to convert them so android can read them using a .crt file extension.