Please help me understand when to use Bid/Ask price on accounts with EURO with EURUSD

Beginner Questions
1

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2

Hello cybtrash… I do not think it needs to be so complicated! If your account is in Euros, and your EUR/USD long is profitable, then you will earn your profit in Euros… And if you trade any other pair, you will still be earning (or losing) Euros…,Am I misunderstanding or oversimplifying your question?

3

I want to understand the details. Again: E.g. my account is in USD and I go long with EUR/USD: This is easy to understand, I BUY USD with BID price and SELL my EURO in exchange.

But now with my account in EURO: When I go long, do I have to pay BID or ASK? And how can I BUY EURO with EURO in exchange?