Question on IDA, how to rename the reversed function name with function-library?

Hello guys, I’m trying to learn for GBA Reversing Project with Misaka & StanH 's C toturial. Through Tiki (or Laqieer, where his name at Github)'s toturial and doc, I successfully made FE8U.gba to Thumb ASM code in IDA, for now what I have achieved is like below:


acaturally I’ve gotten the ASM code, but I failed to rename the function name. In Tiki’s toturial, his(or her wwwwwww) IDA function window is like this:
image
and code window like this:
image .
How to rename the founction?
I hope anyone can make a hint on that. Thank you!



https://www.hex-rays.com/products/ida/tech/flirt/in_depth/

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thank you! I will try to make it out!