Reolink camera/NVR port forwarding

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I use Reolink for my home camera set up. I have the ability to view the cameras externally using a web browser. For some reason only Internet explorer works. I can use an app, but I would like to leave the live feed up on a work computer using the web browser. They request I set/forward my HTTP to port 80. I have not done this. I have basically no understanding of such matters. My question is, by doing this, am I opening up myself to vulnerabilities? I attached a link with their instructions in case my explanation is sub par. Thanks in advance!

Instructions

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