I really don't think it's anything substantial.
It says "A small fee will be charged on each transaction that uses the remote server. You may check and modify your billing preferences once the installation is complete."
So go you'll have to find the billing preferences and go from there.
Wow they really don't make it easy finding out what the fee would be. If you send a transaction post here so people can also find the answer here.
well, i did a transaction of $9.6btc from my localbitcoin account, to the wallet electrum generated for me, i was shocked beyond words, when i sent the money to another wallet, and what arrived in that wallet was $00.2, less than a dollar. on close inspection, i noticed that in the tool tab, under the preference, then transactions menu, the fee is preset to dynamic fee 0.5 btc multiplier 150%. it got me not just annoyed, but frustrated. worst part is that there is no way of contacting them to express your disappointment, and ask for refund. cause taking all $8 usd as fee and sending less than $1 they gotta be out of their mind. you have to check the "set the transaction fees manually" so that when you are sending money you will see the fee directly under the actual money you want to send. even so, if you set the fee to a lower limit, than they suggest. you get an error message that says, "transaction requires a higher fee, or it will not be propagated by the network". so guys be warned. it's my first time and definitely gonna be my last to use their services. i used electrum 2.6.4 portable version downloaded right from their website. now i have moved on to armory. to hell with electrum