Most suppliers of content will come with some info about how to use the template you purchased. Where did you purchase it from? Does the site have any tutorials how to use their products?
Thank you for trying to answer it! I purchased from http://churchmediaresource.com/ I thought they were pretty good and not expensive. I decided to give it a try! I already emailed them asking for a how to replace the content manual. Do you know if there is a standard way of replacing the content?
If it is an After Effects files you really need to be familiar with the software so you can analyze what each layer is and then replace video or text as needed. Its like trying to drive an 18 wheeler by just jumping into the truck
I agree with lasvideo.
Here's the best place to start learning After Effects.
Regarding replacing content in After Effects compositions: If you need to replace the source footage item for one layer with a new source footage item, then you can select the layer and then Alt-drag (Windows) or Option-drag (Mac OS) the new footage item onto the layer in the Timeline panel.