Unable to set correct lot size

 
No matter what I do (under Tools/Options/Signals and also in the Trade tab) I am unable to change the lot size at all, ever. With one signal I tried it was 0.01 regardless of anything I changed (from 95% to 5%) and on another it was 0.1, so the one was too small for me and the other too large. Can anyone advise me what else I can do to alter these trade sizes? Thanks.
 
Alistair:
No matter what I do (under Tools/Options/Signals and also in the Trade tab) I am unable to change the lot size at all, ever. With one signal I tried it was 0.01 regardless of anything I changed (from 95% to 5%) and on another it was 0.1, so the one was too small for me and the other too large. Can anyone advise me what else I can do to alter these trade sizes? Thanks.
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