If you are struggling to provide permission to use your Unvested Moxiedrop to buy Fan Tokens

1. use Moxie cast action -> View balance -> There you would see Use unvested button 
https://warpcast.com/~/add-cast-action?url=https%3A%2F%2Fmoxie-frames.airstack.xyz%2Fmca%2Faction

2. use this dedicated frame for checking balance and there also they would see the 'Use Vested' button - https://moxie-frames.airstack.xyz/mb

3. While placing bid, if you select to bid using Contract and consent is not given, they will asked for that at that time