How do I increase ppi in photoshop for a logo?

sdw

New member
I created a logo in photoshop that I want to have placed on a pen for promotional purposes. When I upload the logo it appears fine; however when the rep reviewed the image it appeared fuzzy. I was advised to make the logo bigger and use a higher ppi. I'm new to all of this and have no idea how to change it or if the increase will even help. Can someone offer step by step instructions?
 
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