Minecraft Forums

I decided to try and add my first mod on my minecraft so I watched some videos and followed the steps and did what they told me to do and everything seemed good to go, so I opened my minecraft and it had the "done loading" glitch so I had to look up how to fix that and now I can't play offline or anything because it says "Not Downloaded". I might have messed something up trying to add a mod and then having to fix the other problem but I have no idea what it could be. If anyone could help that would be great. If it helps I have a mac.