Ok, solved it.
So you guys might have noticed that the main page here said that it was under the modmyi source but we were downloading it from the ifonetec source. So I simply went into packages (not sources) and removed the ifonetec package and refreshed cydia. Magically this made Mivtones appear under modmyi, and it worked from there
It doesn't appear on your spring board (confused me) but under settings.