Thanks for reply!
And, it is imposible to manage addresses you send coins from, rigth?
Well there are no "from addresses" even though blockchain explorers show it like that, but no electrum does not allow you to select which inputs (coins you received previously) to use.
There is a way but its a bit drawn out.. You need to go to the address' tab and right click "freeze" the address' you dont want to spend. When you then send a tx it will send it from the amount that isnt frozen.