the analysis space of voxel-level analysis

Dear all, 

<span style="white-space: pre;"> </span>These days I do data preprocessing usin CONN. However in Setup/Options I can only choose the default 2mm voxels.
<span style="white-space: pre;"> </span>My question is that how could I change the size of voxel like (3mm or 1mm)?

<span style="white-space: pre;"> </span>Thank you so very much.

Yours 

Lin