The "service name" your router is asking for is probably a name for your sake, so you can remember what it was used for that forward. It has no effect on the actual forwarding. (Just put "perfect dark" or "pd".)
For port number, there is one single (TCP) port you need to forward, and you can configure that inside PD. Click on the Settings button and on the first page (General) look in the Port field. You can change it if you want to, but you don't need to do that.
(Oh and btw., orange Comic Sans MS is very ugly, consider that each and every of your posts look very silly as long as you use that typeface.)
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