Kelly, welcome to the forum. Can you clarify which seal you mean? Are you referring to the bag seal at the back? If you go to the TM tech library you'll see a post for the front bag seal installation. For me, I took it to the TM dealer in SoCal and had them replace it. It was easier and it turns out only the main top seal needed replacement, the sides were still good.
Also if you can post pics, so we know what you're referring to in future posts.
https://customrvsales.com/