a. What should I do if MetaMask's stuck?
Answer: If MetaMask gets stuck, please try Menu-Settings-Reset Account
By resetting your account, your asset won't be lost.
b. What if MetaMask keeps connecting the network?
If this happens before you log in MetaMask, please try to clean cookie or close Chrome then log again
if this happens after you logging, please try to switch network
Open Chrome extensions（More tools-extension), close Metamask and then open it again
c. Question: What if transactions sent from MetaMask show pending on Etherscan explorer?
Answer: Please restart the browser and then log your MetaMask again.
d. Are there any other ways to add tokens?
Seach token symbol or add its contract address