It says not enough gas, what does this mean? How can I estimate how much gas do I need to make a transaction or it is based on the amount of ICN transferred at once or each time I make a transaction? I didn't noticed this detail regarding to ICN.
add 0.01 ETH in your MEW it's enough to be gas for transaction your ICN to an exchange
to be honest amount like 0.0002 is ok for paying for transaction.
I have made over kill with buying 1ETH once.
But if you want make more transaction you need more 0.0002 than single one.
You have to be aware that ICN are Tokens that can be moved on the Ethereum Blockchain. The cost are minimal, but its unavoidable that you need some "Gas" (Tiny fractions of ETH) to power the transaction, its part of the Transaction process. But its super easy to handle when you get used to it. just put a tiny bit of ETH in the same adress you want to send your ICN from and it works.
Think of it, like you have to plug in your XBOX to the socket to power it with electricity...without it it would not work!