Hi! I'm new on PixelOver!

I rotate a bone and add a key, then when I play the animation, there are no frames. It's all equal. I don't know what I'm doing wrong on adding the keys, but I think it has to do with the fact that every key I add there's a line connecting to the previous one:

Every tutorial on youtube I watch, there is no such line, and I can't figure out how to add a key without that line. I don't know if that's the problem, I just need to know how to properly add a key and see the different frame I've generated.

Thanks!