hwo to get rid of teh Buy line and Sell line

I have a demo account and i placed some trades. metatrader marked my buy and sell with a green line. how do i get rid of hte lines?

On chart, click properties and down on the bottom on color selection you see the ask and stop lines.
Change them to NONE instead of defaulf green and red.

Actaully I think what you want is the following:

Tools > Options > Charts tab .... make sure the "Show trade levels" is unchecked.