What are my limits, and how do I raise them?

Your limits depend on how far your account is verified, and there are three of them: the most you can convert in one go, in a day, and in a month. The exact figures for your account, and how much of each you have left, are on the Limits screen under Account. Verifying your identity raises them. If verification is already complete and you need more room, you can ask for an increase from that same screen.