Hi sparklespenguin and Welcome to Crystal XP 
When you click on the 'Inner glow' of the Blending options, you'll see a view like this in the middle of the 'Blending Options Window'
There you'll see a little square filled with light yellow, that's the play where you've to change the color of the 'Inner glow' in to RGB-141 
(just double click on the square and then a color pallete will open, there change the R, G, and B values in to '141' or paste 8D8D8D next to '#'
And just below that (under Elements, you'll see the parapeter for setting the Value of the size of the Inner glow in pixels 
If you have more problems, just ask us 
Update:* 
You can set the Blend mode in to 'Multiply' from the top drop down list (under Structure)
All the methods described in here are clearly viewed in the picture
. I'm using the tutorial from here 
I'm havin trouble with this bit tho............... 'Double-click on the layer's thumbnail,and then click on inner glow. There you can see a little square filled with light-yellow, double click on it and choose this color : R:141 j'ai:141 B:141 (or #8D8D8D). As for the blending mode, choose Multiply, and finally put the size on 16 pixels.' 
right, off to make my 
