Marketo has not done the best job about being clear on definations of RCA and RCE.
So if I'm clear on what area your reffering too there is a subscription to an RCE report and there is Deep Linking to a RCE report.
In anaytics section, click on Subscriptions tab next to Analytics tab, click on new subscription and click on Report Source and you will have two choices, Default and RCE.
Select your RCE report and subscribe who you want to receive it.
Now for the Deep Link URL in RCE, Right click on the tab of an open report, you have an open to select Deep Link, what this is is a direct URL link to that report. You can share this only with folks who have access to RCE and they will be able to make changes to it too. I use the Deep links in a Excel spreadsheet to update values.
Hope this helps.