Just bought a key logger but scared to use it

Hi, I posted here a couple of months ago. I just happened to look on my H's history and found porn sites and two dating sites. The porn sites were found under sites and the dating sites were under closed windows. My brother checked my router and it seems the porn sites were visited once but not the dating sites were not visited. The sites came up as pop ups. H has cheated in the past so I am trying to keep my eyes open and monitor. There has been some behavior that makes me a little uncomfortable so I bought a key logger to recover pass codes but I am afraid to use it. It is bigger than I thought it would be and do not want to install any programs on his computer as I am not too computer savvy. If anyone reading has used one, can you give me some pointers? The instructions seem straight forward but as I have said I am not too computer savvy but I am trying to learn.

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