Conveting dollar amount into "Volume" on MT4 order form.

 

i know how to setup a trade in mt4 already. but the thing i wanted to ask is how do i have to calculate the lots for example if i want to trade with 500 dollars, because in etoro its easy you just have to choose the amount of money. in mt4 it only is lots as an option. and another thing, is there an option to close my trades faster? because i dont want to always right click it and confirm it in the window. oh yeah and where can i change my leverage?