Can someone please tell me how to customize my FC's crest? We got the ability a while ago, but I can't seem to find the feature. I've checked at the GC desk with all the NPCs as well as my FC window. Maybe I'm missing the obvious...

Also, should a FC change it's allegiance so that it's standing rises with all 3 GCs? My FC is nearly capped with Gridania, and I'm not sure if we need to do anything after that.