BuddyPress cropping avatar

Users who do not have compatibility view enabled in IE8 can not crop their avatars after registration or from their profile. I came across this thread:


One of the solutions was to do this:

1. Download Jcrop (http://deepliquid.com/content/Jcrop.html)

2. Put the jquery.Jcrop.js file on your server in your theme /js folder

3. Link jcrop in your header.php in the header

I have done step 1 and 2, but have no idea how to do step 3 in my header.php. I had a look at their website, but it is over my head and I am worried about interfering with my theme in that way.

Please could someone help me on how to link that file in my header.