Apple wireless keyboard and iPad

So I have the new iPad Pro 10.5. I wanted a physical keyboard to go with it, so I got an older, refurb Apple Wireless Keyboard. I like it, but I need to use the F2 key for work (its important in the electronic medial record at the hospital where I work). But that key only turns up the brightness on the iPad and I can't seem to find a way to get to be regular, old F2. Any thought? I don't there's an app, there doesn't seem to be any settings options (like on a Mac).