How to publish my Roku channel and upload Contant to my Roku channel

I have a Roku channel that has been approved but I don’t know how to upload my third-party link to the Roku channel and make it live on Roku. Can someone please help me with this every time I try to publish my channel, it tells me to enter a key and I have a third-party company that has my Content but I don’t know how to use my third party link to link it with Roku