I need my photos to be 300 DPI. How do I set my Canon Rebel T5 to do that as a default?

[KindSoul65]

How do I set the camer to 300 DPI?

How do I set the photo that was recorded at 5184 x 3456 (L) at 300 dpi?  For some reason the properties show it at 72.  I need it larger for business cards asap.  I use Picasa.  Thanks!

[cicopo]

I'm simply using what I'm used to even though I do the majority of my editing in Picasa. Picasa however doesn't give me the tools to change those settings or if it does I haven't found them. That said until it's getting made into a print it's just numbers.