Adding stencils to my shapes

Hello,

I have Visio proffessional 2013 32 bit version and I am having trouble adding Visio stencils to my shapes.

I download the stencils and place them in my shapes folder in my documents.

I open a Visio drawing and go to my shapes and try to open the stencil I downloaded and I am recieving errors stating that I have to go into the trust center. I go into the trust center and file block settings. The 3 choices at the top are all checked.

The ones at the bottom are all grayed ot I cant click on them.

Can someone help with this?