See if I did this correctly:

In your link to the base64 converter site:

I broused for the file named 644.gif located in my Program Files
I then selected "Encode the Source data to a base64 string"
I then selected "Output Export to textbox(as string)

But what I got was about 2000 characters of what looks like garbage.
If this is correct, where do I put it and how do I get it into the instruction??

Thanks for your help!!