How do I select an option (a line) among the different inputs lines of a paid EA, I try to click or to insert a x inside the [] on the left, I cant

Keith Watford  

The EA seller English is weak and he did not understand my question

thanks for any response

I am a native English speaker and I do not understand your question!

William Roeder  
Exactly. You click on the box or double-click on the name. String(s) and sinput(s) can't be optimized.
that's what I thought does not work from my brand new window 10 computer !