Write documentation on how to add datasets to Community Data

Apologies but I am having severe problems trying to figure out how to add a dataset to COD. I believe that I have to add it to the Lambeth CKAN site first. I have managed to upload the lambeth bus stops location datafile (taken from the google shared drive of datasets). I think it is there but I am unsure how I can make it appear under Lambeth organisation dataset rather than just on the list I have under my login.

I copy the URL info from the CKAN field and then go to COD, choose the add dataset option, click on the DU "go" and paste in the URL. I keep on getting error 500 messages and nothing more.

I would like to know what I am doing wrong and also how we could document the process so that users of COD could know the process of adding datasets.