Easy Tabs Integration Instructions
AttachTermsAndConditions for Magento
If you're using the Easytabs extension, you'll have to perform the catalog product view integration step on the template that they provide, rather than the default template. This is because the Easytabs extension rewrites the block and changes the template so that it can insert it's own stuff.
If it doesn't already exist, copy the file:
to your own theme:
If this already exists, you don't have to do it again.
Next do the exact same instructions found in the catalog product view integration step, except with this new template instead.
Please keep in mind that implementing any modifications to your MageRewards core code does void your support agreement because you're adding dependency to the other module.