Me and my brother just downloaded ygopro to play together but we can't figure out how to pair up. Can someone help me by telling me how I can duel a specific person so we can play together..? Thanks. :(

Open 2 windows or 2 separate Windows computers/ Android Device/ Mac.

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If it's on separate computers on the same network, click on the LAN Mode tab in Multiplayer and then host a duel from there. Your brother should be able to find your hosted duel in there.
If it's on separate computers on different networks, click on the Online tab in Multiplayer, and then select USA or Europe from the list of servers, and host a duel from there. Your brother should be able to find your hosted duel in there.

That's the thing, when I hit online play it prompts me to enter my name, when I push connect it shows two bars, only and a spectate button. There's no options I can access to do that :/