Double click on the blinn shader.
Up at the top where it says "blinn:" type stool into the field.
Under Common Material Attributes select the box for the Color
This will open another window that allows you to select the node type.
Select the File button.
This will bring you back to the attributes of the stool shader.
change the file field to "stool_TXR". This just keeps the nodes organized, so you can recognize which node is for what type of file.
Select under File Attributes the location of the texture map file beside "Image Name:"
Now the texture map is applied to the shader.
Go back to the main attributes tab by clicking on the stool tab.
Under Specular Shading click on the button for the Specular Color.
The Create Render Node window pops up again. Just like the texture map, select the File node.
Under the file field type "stool_SPEC"
Now under the File Attributes, link the "Image Name:" to the location of your specular map.
Now the specular map is linked in our shader.
Go back to the main stool tab. Now we are going to link the displacment map to our shader. This, for some reason is a difficult node to find within the Attribute editor.
Click on this button where I've circled here in pink.