Jenn,
You should have no problem at all reading books in Mobi format. You can download them from this forum, or from sites such as Feedbooks, and transfer them directly on the Kindle via a USB cable. No conversion of any kind is necessary.
If that doesn't work for you, let us know what is going wrong. I'm sure the folk here will put you on the right road.
Welcome to the forum, by the way.
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